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How to add a form inside a specific layout?

I am not that PRO using WindowsForms because I do not use them too much but right now I am developing a Inventory system so this is my approach(design):
I have used 3 FlowLayoutPanels, I am trying to show various Forms inside FlowLayoutPanel3 when clicking specific button in the left panel the flowlayoutpanel3 will show/trigger the specific form.
What I have tried?, well I have read that I can use MDI container and stuff like that but I noticed that it is a different approach because I do not want to show a separate window, just just inside the flowlayoutpanel3 and maximized.
I have been googling solutions but could not find a solution. * OR is there any item in the toolbox to perform this kind of stuff?*
PD: I am using VS2019 and C#.

Create the new form, set it's TopLevel to false, add it to the panel controls and maximize it:
var frm = new Form(); //Or whatever form type you want to use.
frm.TopLevel = false;
frm.FormBorderStyle = FormBorderStyle.None;
flowLayoutPanel3.Controls.Add(frm);
frm.WindowState = FormWindowState.Maximized;
You may need also to make it visible
frm.Visible = true;

Form disappears when resetting Form's TopLevel property

In my application I am displaying a new form which needs to be at TopLevel.
So, I am setting
someForm.TopLevel = true;
Now, I have a checkbox, which will allow user to set it to "not a top level".
When unchecked, i want to set TopLevel = false
But when I do this, my form disappears. Does anyone know why?
Here is my code:
private void stayOnTop_CheckedChanged(object sender, EventArgs e)
{
this.TopLevel = this.stayOnTop.Checked;
}

Because your checkbox is named stayOnTop, I assume you want to set the TopMost property instead of TopLevel.

The setting TopLevel is only meaningful in MDI applications - ones where a parent form has one or more child forms inside it (like Word and Excel used to work).

TopLevelControl is the main form of your application. By setting TopLevel to false the TopLevelControl is set to null. In that case there is no main form to display for your application. If you add a timer that will switch it back to true you will see that it appears again. (It is interesting though that there is no preventing mechanism. For instance it's not possible to add a top level form to another top level form. But you are allowed to get rid of top levels forms entirely.)
So that's why it disappears. If you want it only sent to background you can use SendToBack() method. It will change Z-index of the form. So if there is a window behind your control, the control will be moved behind the window.

Try these codes :
private void stayOnTop_CheckedChanged(object sender, EventArgs e)
{
if(e.checked == true)
{
someForm.TopLevel = false;
}
else
{
someForm.TopLevel = true;
}
}

Hide my application from taskbar

Is there is away to hide my application from task bar?
I have tried:
Me.Hide()
but this hides the form not the application from the task bar.

try this one:
Me.ShowInTaskbar = False

Use the ShowInTaskbar property and set it to False in your Form.
You can do this in the designer, too:

use ShowInTaskbar property and set to false.
For example:
Me.ShowInTaskbar = False

Displaying a form within another form

I am building a web browser application using c# and the awesomium web framework . I have a form containing a dock panel within which I would like to display another form that holds the awesomium web-control . Basically the parent form facilitates creating tabs and the one with the webControl has the browsing engine and is rendered within the tabs .
Is this possible ? If yes , can you give me some tips on how to.

You can embed a form in another control if set TopLevel = false;
private void EmbedForm()
{
Form f = new Form();
f.TopLevel = false;
f.BackColor = Color.White;
f.FormBorderStyle = FormBorderStyle.None;
f.Dock = DockStyle.Fill;
f.Visible = true;
panel1.Controls.Add(f);
}

Move common UI content to UserControl and use it in a both form.
It is a most common practice.

Disable resizing of a Windows Forms form

How do I turn off the user's ability to resize a Windows Forms form?
I'm having it resize itself on a click.

Take a look at the FormBorderStyle property
form1.FormBorderStyle = FormBorderStyle.FixedSingle;
You may also want to remove the minimize and maximize buttons:
form1.MaximizeBox = false;
form1.MinimizeBox = false;

First, select the form.
Then, go to the properties menu.
And change the property "FormBorderStyle" from sizable to Fixed3D or FixedSingle.

More precisely, add the code below to the private void InitializeComponent() method of the Form class:
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle;

Explanation
By default, FormBorderStyle property has the sizable value FormBorderStyle.Sizable assigned. Which enables form to be resized.
There are 7 kinds of FormBorderStyle property values available to use.
None
FixedSingle
Fixed3D
FixedDialog
Sizable
FixedToolWindow
SizableToolWindow
Depending upon the kind of form, we can assign the appropriate value accordingly.
Assuming your form name is form1.
Choose any one from below to make it as Fixed
FixedSingle, Fixed3D, FixedDialog makes the form non-resizeable, assigning None will also work but won't make sense without a control box in case.
Code
Code snippets below, use any one of them
FixedSingle
form1.FormBorderStyle = FormBorderStyle.FixedSingle;
Fixed3D
form1.FormBorderStyle = FormBorderStyle.Fixed3D;
FixedDialog
form1.FormBorderStyle = FormBorderStyle.FixedDialog;
None [Optional] Note: There'd no control box
form1.FormBorderStyle = FormBorderStyle.None;
Or, Graphically
We can apply it graphically like this.
Make sure you've selected the form which you want to make it fixed size. then you'll see a property named FormBorderStyle property there in Properties window.

Another way is to change properties "AutoSize" (set to True) and "AutosizeMode" (set to GrowAndShrink).
This has the effect of the form autosizing to the elements on it and never allowing the user to change its size.

None of these answers worked for me, perhaps because my window had a status bar. To fix I did this:
StatusStripObject.SizingGrip = False
The same works for a StatusBar object, e.g.:
StatusBarObject.SizingGrip = False

There is far more efficient answer: just put the following instructions in the Form_Load:
this.MinimumSize = new Size(Width, Height);
this.MaximumSize = this.MinimumSize;