[UI] pseudo-section colorbar and size

Concern : UI
Platform : macOS/Linux/Windows
Problem Description : On small screen (13 inches), the colorbar of the pseudo-section is unreadable (too many ticks). We can certainly try to decrease the default number of ticks to 5 max and/or add a horizontal drawer like we have in the "forward" tab
How to reproduce it :

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information