Specifically hiding the Experience bar on Shift being pressed similarly to No Hunger but that mod also removed the hunger bar

What is the use case, do you want to see everything else at all times except for the experience bar?

I really like the idea of not reserving space for elements not currently displayed. Will have to see if I can introduce that in a manner that doesn't make the code a proper mess.

Most likely I can't think of anything else where a toggleable hud component would be nice. But yeah it would be a great addition and thank you for even considering it.