Switch display resolutions or adjust your screen brightness and colors (time-based) from the menu bar.
Check out these Mac Menu Bar Display Apps:
Collection:
Display Apps
Collection:
Display Apps
F.lux
Collection:
Display Apps
Display Menu
Quickly check for available resolutions, refresh rates, or retina capability on any of your internal or externally connected displays and projectors. Switch between aspect ratios or turn on mirroring with a single click.
Collection:
Display Apps
Stay
Stay keeps windows in their place. This menu bar app ensures that your windows are where you want them, even as you connect and disconnect displays.
Collection:
Display Apps
Shifty
A macOS menu bar app that gives you more control over Night Shift.