- macOS Bartender is an app I have been using on and off for years. It is a great app if you have way too many things in your menu bar. I'd wish it was more complex, but I guess most of the limits are in the OS.
What is does is that you get to pick what menu bar icons are in the menu bar, and move some off to a sub menu bar or just hide some. There are also some featues, that I don't use where you can show them when the icon change.