If all functions are inside the same file where you are, just use the Structure Panel ( Alt + 7 ).
Alternatively use Navigation | The file structure ( Ctrl + F12 ), which is very similar to the structure panel (some consider it more convenient (more keyboard-oriented) + it can display more elements depending on the language, etc.).
Otherwise - see answer from @Eric - Navigation | Character ... ( Ctrl + Alt + Shift + N )
Lazyone
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