Option to expand sidebar from hovering full height of left edge of screen (or help find CSS class for that)

I’m trying to find a way to target that arrow thingy to make it full height (so we can expand the sidebar as before) but just found these generic classes:

flex justify-center items-center flex-shrink-0 select-none p-1 h-[calc(min(47px,100%-8px))] relative left-2

Could someone from the team please help with this?

Or just add an option in settings.

Thanks.