I have a 4K display now. Testing around, i found that after a resolution change, one tool bar, holding the drives, is misaligned to the left, showing some arrow symbol for expanding (like there wasn´t enough space).
It seems, like the original alignment, which for me is several standard menues at the left side, & the drive buttons (plus F3 search field at the right) isn´t properly restored (maybe with 4K only?). This part should normally be aligned with the separator bar between the file displays.
I just found out, that this issue was partly reintroduced in version 12.6.2, as ist seems. the correct layout is stable, unless i use Prefs STYLE=normal, or similar. This is, by the way, the same default style, i'm using when Opus is launched. I use the Prefs STYLE command sometimes, to reset the lister, when i had many addional tabs open. But closing the lister & restarting fixes the misplaced tool bar.
Leo, you're right, once again. The autostart is indeed a layout, which i have confused with style (i think, both are quite similar, when nothing else was changed in the arrangment of the listers)
I will re-check to save the layout properly. In the meantime i have changed the shortcut to just load a both sides tab group, which basically does the same for me, restoring the basic set of tabs.