"Share" button is inactive in the "Choose what to share" window
Symptoms
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The "Share" button in the "Choose what to share" window is greyed out or unclickable.
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You are unable to proceed with screen sharing despite the window appearing.
Cause
The Entire screen has not been selected in the sharing dialog.
Resolution
- Click on the desktop image in the Entire Screen tab to highlight it with blue frame
- Click Share:
See also this step-by-step instruction below.