GeezerVison

Turn on Focus mode and switch to any app — every other app hides automatically. Whatever you move to becomes the only thing on screen, so there's nothing left in the corner of your eye to pull you away.

Some apps you always want in sight. Add any app to your always-visible list — a chat window, a music player, a reference doc — and it never hides, no matter which app you switch to. Everything else still disappears.

SoloFocus lives in the menu bar. One click toggles Focus mode on or off. Set a global keyboard shortcut and you can flip focus on or off without ever opening the popover. It can launch automatically at login, ready whenever you start your Mac.