Hello,
I used to know but forgot 
How do you remove this top part of the Core GUI
You can’t however you can set the transparency to 1, so you can fully see through it, use a local script and run this code:
game:GetService('Players').LocalPlayer:WaitForChild('PlayerGui'):SetTopbarTransparency(1)
Ah, yes. I forgot about that.
You can use this by making a LocalScript, with the following code.
game.StarterGui:SetCore("TopbarEnabled", false)
If this helped please mark this as the solution to help others who come across the same question.
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does this work inside Roblox studio cause for some reason it’s not working?
Where have you placed your script?
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Starter GUI and even tried in StarterPlayerScripts
Are you trying to get the red bar to shift upwards to where the topbar is intended to be? On your ScreenGui, make sure the property IgnoreGuiInset is true. That’ll, regardless of if the topbar is hidden or not, automatically be shifted down by the 36 pixels that the topbar occupies.
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Thank you dude! Yes I was also trying to do that. Sorry if I didn’t explain myself that well, not really that familiar with UI stuff
game.StarterGui:SetCoreGuiEnabled(Enum.CoreGuiType.All, false)