Moreover if I press Shift + F11 on my XYplorer I get
while the fresh copy gives the full screen preview.
Maybe it's obvious but, how can I "fix" the problem?

Finally, maybe a bug, if we exit preview mode (Ctrl + Q) via the menu or the toolbar button, the checkmark is removed while if we exit preview mode using the info panel (i.e. click properties tab and click toggle info panel button), the checkmark doesn't reflect the changed state.