This may be a Mac only problem, but …
The file keeps reverting to a smaller window size compared to my display size. I can resize the workspace window by dragging the handles to full screen, then use SU>Preferences>Workspace>Save Current Window Size, followed by a file save. On reopening, the workspace does not fill the display as set previously.
I also tried, model info>purge>fix. Also tried workspace>reset.
I found a reference to a similar issue, but uses the same approach I have tried.
The image shows the left hand side, but there is a larger gap on the right side.
Any help, much appreciated.