What do you want to achieve? I want to remove the default toolbar and replace it with something else.
What is the issue? I don’t know how to make the toolbar disappear.
How would you remove this: 
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That backpack is a CoreGui.
you can enable it by setting the coreguienabled to false in a local script
game:GetService("StarterGui"):SetCoreGuiEnabled(Enum.CoreGuiType.Backpack,false)
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