Slack▾on macOS Sonoma▾

Start sharing in Slack and stop again straight away. That sounds roundabout, but it is the trick: macOS only lists an application after it has asked once. Before that you will look for it in vain.

Open the Apple menu at the top left and choose System Settings . Faster: press Command+Space and type " System Settings ".

Go to Screen & System Audio Recording .

Lets the application read what is on the screen — which is what the others then see.

System Settings > Privacy & Security > Screen & System Audio Recording Copy the click path

Open Settings nowOpens System Settings directly at the right place. If nothing happens, the path beside it gets you there just as well.

Find Slack in the list. If it is not there at all, the + below the list is the way in.

Turn on the switch next to Slack .

tccutil reset ScreenCapture com.tinyspeck.slackmacgap Copy

Start a Huddle and then click Share screen .

Now really quit Slack — Command+Q, not just closing the window — and start it again. macOS does not apply a freshly granted permission to a running application, and this is exactly where most people get stuck: everything is set correctly and it still does not work.

Go to Accessibility .

Lets the application move the mouse and type. Without it somebody can watch, but touch nothing.

System Settings > Privacy & Security > Accessibility Copy the click path

Open Settings nowOpens System Settings directly at the right place. If nothing happens, the path beside it gets you there just as well.

Find Slack in the list. If it is not there at all, the + below the list is the way in.

Turn on the switch next to Slack .

tccutil reset Accessibility com.tinyspeck.slackmacgap Copy

Two different things: the other person can draw on the picture right away, but that moves nothing. Real control has to be requested by them and confirmed by you.