Is there a way to avoid hidden forms showing up in the taskbar mini window control panel?

This is for a Delphi application with a child form that was shown and then hidden but not released. If the user hovers over the taskbar (Windows 10) "mini-view" of the application, hidden forms become visible (on hover). They will hide when the user clicks on the mini-view to change focus to the application. Is there a way to avoid this?

To recreate:

• Create a new VCL Forms Application.
• Add a new shape to the project and set it to auto-create.
• Add a button to show and then hide the form (or open it with ShowModal).
• Run the application
• Click the button to display the second form, and then close it.
• Hover over the application taskbar button to display a mini-view of the main window.
• Hover over the mini-view and see the hidden windows appear on the main form.

Note that minimizing the application and restoring it "captures" the impact until the next form display. Perhaps this is a clue to what is causing this or a hint for a worker? It's not a huge problem as it doesn't cause any real problems, but it looks unprofessional.

Adding code as requested (It won't be very interesting though.)

program Project1;
uses
  Vcl.Forms,
  Unit1 in 'Unit1.pas' {Form1},
  Unit2 in 'Unit2.pas' {Form2};
{$R *.res}
begin
  Application.Initialize;
  Application.MainFormOnTaskbar := True;
  Application.CreateForm(TForm1, Form1);
  Application.CreateForm(TForm2, Form2);
  Application.Run;
end.

// Only code that was added to TForm1:
procedure TForm1.Button1Click(Sender: TObject);
begin
  // Show and then hide the form or use ShowModal and close it before testing the hover.
  Form2.Show;
  Form2.Hide;
  // Form2.ShowModal;
end;

      

        
        
        
      

    

Update. How to show the problem using only Delphi environment.

• Start Delphi
• Open any code file and find the line and then use F3 until you get the "Search not found" dialog, "Restart search from the beginning of the file".
• Close the "Search Not Found" box in step 2.
• Hover your mouse over the Delphi taskbar button and then move it to the mini preview.
• The "Search Match Not Found" window appears in the main Delphi window. I have tested this in Berlin and Tokyo (10.2.1).