if you need to hide it then you're not needing an MDI application in the first place. you can have multiple forms open and able to be used in one application at the same time without it being an MDI app
"It's not possible using .NET properties or methods as far as I'm aware. That icon is there so that you can click it to get the system menu for the child form. Even if you set the ControlBox property to False, which removes the system menu, Close button, etc. when the form is in a normal state, that icon is still visible and you can still click it to display the system menu. If it's possible to get rid of it it would require using the Windows API."
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