I have a simple question. How do we expand all groups by just one click? And also how do collapse all of them?

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If by Groups you mean Regions/Outlines, there a number of region controls in the Edit -> Outlining Menu (which also have handy hotkeys).
You may be interested in ‘Toggle All Outlining’ – Ctrl-M, Ctrl-L, or ‘Collapse to Definitions’ – Ctrl-M,Ctrl-O.