EOS R EF lenses reduce image resolution and aspect ratio

[ttssingleton]

I recently upgraded to an EOS R I purchased an adapter to use my EF lenses but whenever I use canon branded lenses my image quality is only 12 mp and the aspect ratio is 1.6 I cannot change it and it only happens with Canon branded lenses. Is there something I may be missing or doing wrong since I’m still learning this camera functions?

[Tronhard]

If this resolves the issue, it might be a good idea to select the most appropriate response as a solution so others with the same issue will find it easily, and you will not get people continuing to send you redundant information.