Hello @RonF84 ,
Are you able to provide a screenshot? Does zooming in/out of your browser screen help at all? Normally, you should be able to exit the CREATE sub-window by clicking the X or clicking outside of it.
If the X just seems to be missing entirely, it's possible there's something interrupting certain aspects of our site coming through on your end, and it may be worth checking out some connectivity troubleshooting.