How to create a full-scale GUI

QUESTION/PROBLEM

Hello everyone! I am trying to create a menu for my game. It turns out that when I was about to create my ScreenGui, I noticed that there is no right measurement for the entire game screen to be covered by that ScreenGui.
Example:
Opera Instantâneo_2021-09-15_161652_www.youtube.com

If we see well, we noticed that a part of the Screen is not covered by the ScreenGui.
Can you help me?

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Gui properties and enable “IgnoreGuilnset”

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