BetterDisplay

BetterDisplay is a truly wonderful tool! It lets you convert your displays to fully scalable screens, manage display configuration overrides, allows brightness and color control, provides XDR/HDR brightness upscaling (extra brightness beyond 100% for compatible XDR or HDR displays on Apple Silicon and Intel Macs - multiple methods available), full dimming to black, helps you create and manage virtual screens for your Mac, create Picture in Picture windows of your displays and gives you a host of other features to manage your display's settings like display and color mode easily from the menu bar. It can even disconnect/reconnect displays on-the-fly!