For Gimp 2.10 reset the Gimp windows back to default
Edit -> Preferences -> Window Management then click on
Reset Saved Window Positions to Default Values Ok that & restart Gimp.
Then another couple of videos that might help.
moving the tabs around
https://youtu.be/01PeLL1F8KgQuote:
No where can I see a way of manipulating the height of each of the right side docks as I can in 2.8
Same as Gimp 2.8 there are 'hot-spots' to enable click-drag to resize. If you have a laptop (often 1366x768 pix display) you can make adjustments that help resizing the docks
set up for smaller computer
https://youtu.be/8M2P0N-qhm0