Clickup has this very simple hotkey for the sidebar where if you press Q it hides/shows the sidebar. I used this all the time in Clickup and I really miss it.
I switch between different screen sizes and when I present on Zoom I need to sometimes go +150% zoom, so the sidebar takes too much space to keep at all times, yet I still need to navigate quickly.
I know you can just move your mouse and it appears while hovering, but meh, moving your mouse is inconvenient compared to pressing a key (Q) 