Gimp seems too dark
Is it the theme that you need to change.
In Edit -> Preferences -> Theme There are Dark / Grey / Light / System options The default is Dark example: https://i.imgur.com/IGpgmST.jpg
and
In Edit -> Preferences -> Icon Theme Change from a Symbolic theme to a colour theme and adjust the icon size example: https://i.imgur.com/PN7yFgF.jpg
In addition, if you prefer the older tool box style Edit -> Preferences -> ToolBox and untick Use Tool Groups example: https://i.imgur.com/sH8dMrW.jpg
Is it the theme that you need to change.
In Edit -> Preferences -> Theme There are Dark / Grey / Light / System options The default is Dark example: https://i.imgur.com/IGpgmST.jpg
and
In Edit -> Preferences -> Icon Theme Change from a Symbolic theme to a colour theme and adjust the icon size example: https://i.imgur.com/PN7yFgF.jpg
In addition, if you prefer the older tool box style Edit -> Preferences -> ToolBox and untick Use Tool Groups example: https://i.imgur.com/sH8dMrW.jpg