Mac Screen Sharing Permissions
When your presenter is on a Mac, and when he/she shared the screen, sometimes, it may not appear. The indications are as follows.
- The preview is not appearing in the AV Controls panel for him/herself
- Others are seeing a blank/white screen
This guide helps to fix the problem.
This problem arises due to Mac OS Permissions
Changing Mac Screen Sharing Permissions
- To change these preferences on your Mac, choose Apple menu
> System Preferences, click Security & Privacy 
- Select Screen Recording
- Click the Padlock button at the bottom left to open the options for editing
- Select the checkbox next to an app to allow it to record your screen (i.e. Google Chrome)
- If the app is not listed, add the app using the '+' button and make sure it is checked
Note: Deselect the checkbox to turn off access for that app later on if needed - Lock the permissions using the padlock
- Restart the browser
If you have upgraded the Mac OS or if the app is already listed, try the following.
Removing and Adding the App Back
- To change these preferences on your Mac, choose Apple menu > System Preferences, click Security & Privacy
- Select Screen Recording
- Click the Padlock button at the bottom left to open the options for editing
- Remove the added app (i.e. Google Chrome)
- Lock the permissions using the padlock, exit, and go to the options once more (the settings box may ask for this step by itself)
- Now, add the app using the '+' button and make sure it is checked
- Save the settings by locking the permissions
- Restart the browser
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