Go in the config files. You can't do this in game

I have another problem, when I use shaders the bar does not appear.

I'm using Complementary Shaders - Unbound

Actually I just checked this again and it seems like this is a 1.21.4 issue. (Mojang changed some rendering stuff there)
Cuz on older mc versions when using Complementary Shaders - Unbound, the bars render fine. So this does seem like a Neat issue, which means I can can try fixing it hehe :)

I'll open an extra issue for this!

Originally posted by @Uraneptus in #171

Reference images:

[1.20.1, same on 1.21.1 - WORKS]

[1.21.4 - DOESN'T WORK]