new version 4.7.0 is on the store, with the fix for dark theme
but...I think there is some issue with update
auto update doesn't work in my case
even if I force update, nothing happens
(clicking on the button in top right corner on internal extensions page opera://extensions/ )
If you are experiencing the same issues, I would suggest to reinstall extension
remove it first from opera and then go to
https://addons.opera.com/en/extensions/details/v7-bookmarks
and install it again
btw. if some of the options that you change on settings page don't work (like changing theme, additional dark theme, show url, number of children in folders...)
in that case use reload button on top of the sidebar (Opera UI)
new sidebar is doing some kind of caching, and even re-opening extension in sidebar doesn't apply new changes