This issue has been fixed in the latest version of Jive. Videos should now correctly support viewing in full screen. There is nothing you as the user should need to do.
We have found there is a recent problem with being unable to show the full screen button on the embedded video player in the community. We have logged this issue with our supplier. We will try to include full screen links on videos going forward.
In the meantime there is a workaround if you find a video that you can't view full screen:
- Place your mouse over the top right of the video and the Embed button will appear.
- Click on this to view the embed code. The embed code is a line starting <iframe src="https://player.vimeo.com/video/<videonumber>".... Take just the URL (starts https:// until ") and run this in your browser to run the video full screen.