"Configure toolbars" should be horizontal rather than vertical.
There is something wrong with the toolbar configurator.
Most toolbars are horizontal, but this window present them vertically.
Users have to rotate it 90° in mind to map 1:1 the toolbar, thus make it unintuitive and "hard" to use.
So I propose to display those two panels (available actions & current actions) horizontally, and longer by default.
Edited by shenleban tongying