Option is the most irritating feature of mac UX, everywhere it keeps popping new hidden features, it is true even for top menu and simple navigations.
Most irritating for me is if all windows of an app are hidden (minimized), simple Cmd+Tab doesn't brings anything to focus, but some gymnastics with Option and voila now you can see your Slack.
Most irritating for me is if all windows of an app are hidden (minimized), simple Cmd+Tab doesn't brings anything to focus, but some gymnastics with Option and voila now you can see your Slack.