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VS intellisense not working on solution with multiple projects

I am working on a .NET Core/C# solution that contains multiple projects. I have done so before but for this one I set up everything through a remote server in a linux terminal. Once all my projects were created and pushed to GitHub, I pulled to my local machine. Problem I am running into is that intellisense is not working at all in any project in my solution. I am wondering if I set up everything correctly or if there is something I am missing. Below is some screenshots of my directory and one screenshot of VS.
root dir from repo
1 dir down into BlabberApp folder
2nd dir down into BlabberApp.DomainTest
What is shown in VS when I open root dir
What is shown in VS when I open solution file
I have tried opening using open file for: .csproj file, .cs file, as well as open folder for various folders that hold my separate projects. I also tried to open folder to the BlabberApp folder which contains the folders that hold my .sln as well as the folders that hold all my separate projects. I need intellisense to recognize references some projects have with each other. I also need it to recognize my tests to properly test everything. One thing peculiar I found is when I open the .sln file it shows in the solution explorer that 0 projects are loaded. Also none of my tests are recognized in the test explorer (I have tried cleaning and building the sln with no changes showing in test explorer).
I have also gone through the steps of going to tools -> options -> text editor -> c# -> intellisense to check/uncheck the boxes under completion lists. Any advice would be helpful! Thanks

It seems any of your projects are not listed in your solution. Somehow they unloaded from the solution. You can add the projects one by one in the solution. Or you can take help of a plugin that will add all projects from the solution folder at once. please add them by the following step:
Add this VS extension
Right-click on the solution and click on Add multiple projects
check Add solution folder
Click Load Projects From Folder
Select the solution directory
Select all projects
Click start
please follow the link instructions for more details.

Open a csproj and not the entire solution

I am working on a solution that contains 30 cs projects. I am focusing on only 1 project so I preferred to open only this specific project.
Once opening this specific project, it loads the entire solution wiht all the others 29 projects.
Is there a way to open only this specific csproj?

The following structure can be used to get the desired behaviour:
Create a new Visual Studio solution
Delete the created default project
Add an existing project to the solution
Set the project as startup project (for re-build etc...)
You are now ready to go

You can do this in minutes and it's quite simple. Each sln file contains a number of projects that are written in this form :
Project(...) = "name.of.the.project", "{unique identifier of the project}"
and below that are the configurations for that project.
So you can write a javascript file to copy your original sln into each project folder found in that sln. After that iterate through each project folder and for each sln remove other projects. The javascript file can be runned using a .bat or cmd.
In this way you can assure that each project of your solution has inside his folder a new solution that contains that project.

We have a solution at work which has hundreds of projects.
So what we have done is have a Main.sln which contains everything. Then were have broken up the rest of the projects into different smaller solutions where they are grouped by relevance.
ie. All the database projects are in one solution, UI projects in another etc.

Is possible to change references (dlls) default build folder in visual studio?

Is it possible to change the references build folder? I want my dlls when i compile to be in a /bin/Debug/Data and not in /bin/Debug.
Thank you
Update 1: Is it possible when i build the references dlls are posted in another folder?

You can use Post-build Event in project properties.
Using this event you can copy dll file any other place or directory after build
but dll project must be added in this project.

Go to Projct properties. Tab "Build". Change Output path

If I am not wrong I believe you can using Element . You can do this in app.config file The following example shows how to specify application base subdirectories the runtime should search for assemblies.
Personally I have not tested this. I found this in here: https://msdn.microsoft.com/en-us/library/823z9h8w.aspx

This article demonstrating Setting a Custom Reference Path
Add the following line before the main Form is initialized
AppDomain.CurrentDomain.AppendPrivatePath(#"bin\Data");

How to include other files to the output directory in C# upon build?

I have some library files needed for my application to work.
My application has a setup and deployment included.
I already know that in order for a library file to be added to the output directory of the application when installing, I just have to reference those libraries inside the .NET IDE before building... the only problem is that these libraries can't be referenced... So I need to be able to copy these libraries to the installation directory of my application... At the moment, I am copying these libraries manually...
Addendum
I also did try to add these library files as an Existing Item to my project and marked each library files' Copy to Output Directory to Copy if newer on their properties but still not getting the solution I want.
Update 1
Thanks for you help guys it helped me solve my problem, I managed to make the solutions you posted work except for one... #Matthew Watson's post.. I even managed to find a solution too so I wanted to share it with you also.
Heres what I did:
I opened the setup and deployment project in my application.
Under the Application Folder Tree, on it's right side, I right clicked..
then clicked Add..
then clicked File
and then browsed for the files I wanted to add to the installation directory
and click open.
But out of curiosity...I am still trying to make what #Matthew Watson posted work...
Update 2
I forgot to update this post yesterday, I already manage to make Matthew Watson's solution worked yesterday. Thank you again for all your help guys.

You can add files to your project and select their properties: "Build Action" as "Content" and "Copy to output directory" as "Copy Always" or Copy if Newer (the latter is preferable because otherwise the project rebuilds fully every time you build it).
Then those files will be copied to your output folder.
This is better than using a post build step because Visual Studio will know that the files are part of the project. (That affects things like ClickOnce applications which need to know what files to add to the clickonce data.)
You will also be more easily able to see which files are in the project because they will be listed with the source code files rather than hidden in a post-build step. And also Source Control can be used with them more easily.
Once you have added "Content" files to your project, you will be able to add them to a Visual Studio 2010 Setup and Deployment project as follows:
Go into your Setup project and add to your "Application Folder" output the Project Output called "Content Files". If you right-click the Content Files after adding them you can select "outputs" and see what it's going to copy.
Note that Setup and Deployment projects are NOT supported in Visual Studio 2012.

You can use Visual Studio Post Build Event - Copy to Relative Directory Location. Which are basically scripts that are executed on build of specified project.
So you can use it to copy binaries you need, before actually running your application.

Changing The Name Of A C# Project Folder?

I have a main project directory with the following contents:
SubDirectory (Directory)
Project.sln (Solution File)
When I try manually changing SubDirectory's name in my Windows explorer, I get errors when I open the solution file. How can I rename this directory without affecting my solution?
Thanks!

Rename it in Visual studio, or edit the .csproj/.sln file with a text editor and fix the refrences.

Open the solution file in a text editor and rename all references to the old folder.

Open up the .sln file in notepad. You'll see a line like this:
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "myproject", "myproject\myproject.csproj", "{DF81752F-37EE-4F4E-BC22-B09C8D05ED78}"
EndProject
If you want to rename the folder from myproject to newproject, you can change myproject\myproject.csproj to newproject\myproject.csproj (or whatever).

Change the name in SolutionExplorer.. it will work fine..
However it doesn't gurantee problem with Source Control or TFS you will need to resolve them manually

Your solution has the paths to your project files embedded in it, which includes the folder name. If you want to rename the folder, you have three options:
Close the solution. Rename the folder, then reopen the solution. The projects will show up as gray, and you'll need to click each one and locate the project file in the Properties window. Note that this may remove project references, but it may not. This is what I would suggest.
Open the solution and remove the project(s) within that directory. Note that this will remove any project references from any other projects that reference the project(s) that you're removing. Rename the folder, then add the project (and any project references) back.
Close the solution. Rename the folder, then open the .sln file in Notepad (or some other text editor) and fix the paths manually. This will preserve any project references.

When I have done it, I manually change it, then open the solution. You will get an error about not being able to find the project file, just choose to locate it, and it will re-map it. If you are using VSS, make sure everything is checked in first.

There are probably paths in project/solution related files that contain the old directory name. You'll either have to update those manually or find a way to rename the project from within Visual Studio.
This might help you rename the project:
http://msdn.microsoft.com/en-us/library/3e92t91t%28v=VS.90%29.aspx

In Visual Studio solution explorer,
edit the project properties to change
the assembly name, namespaces etc.
etc. to what you want.
Rename the top
Project nodes in VS solution explorer.
Shut Visual Studio down.
Open Windows explorer and rename your
folders and .csproj files to what you
want.
With a text editor and NOT Visual
Studio, open up the
sln file,
the .csproj files and
anything else you've renamed.
do a
Find & Replace looking for the old project strings, filenames,
namespaces (if required - I suggest
you leave that bit for when all has
been transitioned) and replacing them
as required.
I'm suggesting you'll
need to be selective because I don't
know how you've named your projects
and .csproj files ;-)
Once you've done all that, quit your
text editor and try opening up your
.sln file again.
Do a Rebuild the first time to remove any artifacts from the old configuration/naming.
HTH