What are some useful Windows Features most people don't know about?

Wondering if theres any useful features that are a game changer for productivity, even small things.

Recently I realised in the taskbar settings -> Taskbar Behaviours and turning off "Combine Taskbar buttons" to never allows you to swap tabs quicker. Useful when I'm making notes and have 2 Word documents open, instead of them stacking and having to hover over them I can swap quicker.

Do you know any other features?