Cannot find screen sharing

Hi,  I have an existing meeting I just started.  It's working fine,  but I cannot see a 'screen sharing' option during the meeting. 

Screen sharing is enabled under admin>account management>account settings>in meeting (basic)

Host only is checked (enabled)
Screen sharing presenter view is checked (enabled)

Disable desktop screen sharing for meetings you host is not checked.  (so it's not disabled?)

Disable screen sharing when guests are in the meeting is checked.  (disabled).   But there is still no screen sharing option when I'm testing the meeting as the only person (host) in the room.