Creating a customizable Toolbar/Backpack with a hidden inventory

Hey how do i create a backpack on this kind of level/capabilities. Each one of those screen shots have hidden ability, were if u press the apostrophe button a inventory pops up.

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I’ve tried a lot of things, but there isn’t a tutorial out there that will help me sufficiently code on this level/capability.
(also i’m not greatly proficient in GUI’s so any help would be appreciated)
thanks in advance

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We’re you able to achieve this? I’m also having trouble with creating this style of inventory.