IgnoreGuiInset
IgnoreGuiInset is a boolean property of ScreenGuis that, when set to true, will force the GuiService/GetGuiInset|GUI Inset imposed by Roblox’s CoreGuis to be ignored by this ScreenGui and its descendants. This means that an element with a UDim2 size of {1,0},{1,0} will fill up the entire screen, without a 36 pixel gap reserved for Roblox’s top bar.