Follow these instructions to be able to start screen sharing.
The full Wizyconf Videoconference User Guide: https://confluence.wildix.com/x/j4CEB
The first time you try to share your screen, you are prompted to allow sharing your screen. In case you decline it, you need to give access manually.
Take the following steps:
- Go to macOS System Preferences -> Security & Privacy
Open Privacy tab -> Screen Recording and give access to a browser you (Chrome in the example below) use to share: