Is it possible to minimize all functions at Android Studio at once?

You can go to Setting->Editor->General->Code Folding->see checkbox then check show code folding outline,then apply.(Window OS)

(for windows Users)

Same time All Methods Collapse : CTRL + SHFT + -

Same time All Methods Expand :CTRL + SHFT + +

(for Mac Users)

Same time All Methods Collapse : Command + SHFT + -

Same time All Methods Expand :Command + SHFT + +

Here is the current way of expanding/collapsing in Windows...

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You can go to Code > Folding > Collapse All

In my case the short-cut is CTRL+SHFT+/.

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