I ran a few little tests to narrow down when this issue is happening. It didn't matter where I placed my toolbar. Didn't matter if "startup tab" setting is TVShows or Scan.
TLDR puzzler: why does the app display properly on a secondary monitor, all other things being equal?
I have two identical 4k monitors at 175% text size (1st = primary). When I open the app on:
1st maximised -> issue (~2 inches of black to left of panel)
1st not maximised -> wider issue (panel appears halfway across display area)
the width of the list of TV shows does appear to have an effect on the position of the info panel
1st maximised with "system enhanced DPI" property -> info panel is ~2inches to the left instead
1st maximised with "application DPI" property -> info panel is fine, all button and list text is a tiny bit smaller
2nd maximised -> no issue
2nd not maximised -> no issue
TVR 4.6