How to display a form or a "please wait" panel while executing a task in FMX Delphi 10.2?

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To display a form or a "please wait" panel while executing a task in FMX Delphi 10.2, you can follow these steps:

1. Create a new form or panel with a label or message informing the user that the application is processing a task and they should wait.
2. Set the visibility property of this form/panel to false in the Object Inspector.
3. In your main form, create a function or procedure that executes the task you want to perform while displaying the "please wait" panel or form.
4. In this function, set the visibility property of the "please wait" panel or form to true.
5. After the task is completed, set the visibility property of the "please wait" panel or form back to false.
6. Call your processing function wherever you need it in your application.

Example:

Assuming you have a "frmPleaseWait" form with a "lblMessage" label, and your processing function is "ExecuteTask":

procedure TForm1.ExecuteTask;
begin
  try
    frmPleaseWait.lblMessage.Text := 'Processing...'; // Update the message displayed in the "please wait" form.
    frmPleaseWait.Visible := true; // Show the "please wait" form.
    // ... perform your task ...
  finally
    frmPleaseWait.Visible := false; // Hide the "please wait" form after the task is completed.
  end;
end;

You can then call this function wherever you need it in your application, for example:

procedure TForm1.btnProcessClick(Sender: TObject);
begin
  ExecuteTask;
end;

This will display the "please wait" form while the task is executed, and hide it afterwards.