Settings are not restored when opening Dopus

My problem is as follows: when I make some customization (e.g. put the operations toolbar between my source and destination panels in horizontal view, show file content with F7 key...), it is not saved. When I reopen Dopus, the latest customization is not restored automatically and I have to restore it manually via the Settings->Backup and Restore menu. :frowning:
Any idea why?
Thanks everyone!

Settings > Set Lister Defaults, to save changes like that.

Thanks Leo!