Summary of the issue you are facing:
Video source is HD = 16:9, but I get a 4:3 view
Hey @PHGSchmitz welcome to the Nextcloud community 
You posted your request in the support category. Unfortunately you ignored the template and a lot of information to help you is missing. Please edit your original post and add all required details like Nextcloud version, webserver type and version, os version, related log file content. Use the support template.
Without additional information the community members cannot help you.
As far as I know, 4:3 is the standard for Nextcloud Talk and cannot be configured.
There is also an open feature request on GitHub regarding this topic:
https://github.com/nextcloud/spreed/issues/1806
If you think this is an important feature request, I recommend giving it a thumbs up on GitHub so that the developers can gauge how many people want this feature. But please do so as a reaction and not as a comment, so that there is no spam on GitHub.
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