If you create a new database (not using Datagrip), it won't show up in until you go manually enable it to be shown. I ran into so many issues wondering why my created databases didn't show up. (while spamming the refresh button in the toolbar). And ended up spending extra time to verify that they were there
Eventually figured out the setting is hidden in the context menu for a connection. Right click -> Database Tools (click). Get a new popup -> Manage Shown Schemas.
And the kicker is that it's not intuitively named AND hidden under a separate UI element. After not using DataGrip for a while, I end up spending a bunch of time digging through context menus trying to find it again.
What tool is your preference?