Using latest wurst client with the latest mod menu (Minecraft 1.21.5) has a visual issue which combines the buttons of MODS and ALT MANAGER, this is something weird since I wasn't have this problem in Minecraft 1.21-1.21.1 (I haven't played 1.21.2-1.21.4)
Fix suggestion: Maybe make mod menu's button go next like with full width like this
Single . Player
Multi . Player
Realms | Alt Manager
M. O. D . S
(I added those dots to prevent forums from "fixing" them)