Altium - How to lock information window on the top left?
Shift+G

Move your mouse so that the window is where you want it to be fixed and press Shift+G.

If you let your mouse rest in the editing window a while the information window will expand to show you some shortcuts associated with it.

You're lucky you're not using Cadence. I once undocked the command window and found out it can never be re-docked without an re-install. A known bug for years apparently.