That looks like you might have a new computer maybe with a 4k monitor and a very customised layout
You might / might-not want to start from scratch: All of these in Edit -> Preferences
Reset all the windows to default: https://i.imgur.com/aGM8ooc.jpg
Reset the tool options: https://i.imgur.com/V9xr5NQ.jpg
Then to change the dark to a lighter model https://i.imgur.com/IGpgmST.jpg
Coloured icons are still there: https://i.imgur.com/PN7yFgF.jpg
..and if you want to increase the size of the menu fonts
https://www.gimp-forum.net/Thread-Menu-f...3#pid17533
also a plugin to make that easier http://gimpchat.com/viewtopic.php?f=11&t...10#p261235
You might / might-not want to start from scratch: All of these in Edit -> Preferences
Reset all the windows to default: https://i.imgur.com/aGM8ooc.jpg
Reset the tool options: https://i.imgur.com/V9xr5NQ.jpg
Then to change the dark to a lighter model https://i.imgur.com/IGpgmST.jpg
Coloured icons are still there: https://i.imgur.com/PN7yFgF.jpg
..and if you want to increase the size of the menu fonts
https://www.gimp-forum.net/Thread-Menu-f...3#pid17533
also a plugin to make that easier http://gimpchat.com/viewtopic.php?f=11&t...10#p261235