Probably not Opus 13 that changed, but this setting:
- Preferences / File Displays / Navigation / Select previous folder when going up
But you can do the command better in any case. This is all you really need:
Delete .
Although it will take a second or two for it to react and go to the parent folder. If you don't want to wait, you can adapt the "Move everything up" command from Quick buttons for directory organisation to remove the part that moves the files:
@set ChildPath={sourcepath$}
Go UP
Delete "{$ChildPath}"