Apple really needs to just build this functionality into macOS already. You shouldn't need to pay someone else to shove icons into a drawer. And on the new MacBooks with a notch through the center of the menu bar, it always seems like the icons on the right and the menus for the focused app on the left are ever encroaching towards that space.
... or at least allow API access for third-party/OSS apps to do this without needing full screen recording permissions!