If you get a feat, trait, or item to discount an action to a bonus action, e.g. making Disengage a bonus action for a Rogue or Click Heels boots to make Dash a bonus action, PLEASE DO NOT ADD A SEPARATE BUTTON ON THE HOTBAR.

Why can't it replace the existing original place in the UI? Why do I need to see TWO Disengage or Dash buttons now? There's one on the left side with the other role actions and now one on the hotbar. Just overwrite the existing one.