I believe this is similar to an issue some users were experiencing a few months ago. that issue was solved by changing your screen resolution. I would give that a shot and see if that fixes the issue.
here is what one community member had to say who was able to recreate and solve the issue using those methods. keep us updated if you are able to use this possible solution. if it doesn’t fix it I would recommend a support ticket and keeping us updated here will allow the mavens to be on the lookout for similar issues/ solutions too.