4. Enable your device/the Webex app to share and operate your presentation
Please make sure in the security settings of your operating system/your device that Webex has permission to access the camera and the audio system and is allowed to access/share the screen.
These settings can be reversed or reset to default after using Webex. Based on experience, problems with sharing the screen and issues with controlling the shared presentation or a shared document may occur if the system's default settings restrict the access of apps, e.g. to the screen.