Is there a reason you've moved everything out of the file display toolbar and into a lister toolbar directly above it? The end result is almost the same, except you've now got the file display toolbar empty and looking strange & unwanted.
If you've imported a configuration from a much older version of Opus, the thing to do is move those things into the file display toolbar, then turn off the extra toolbar that won't be needed anymore. (You can change the color of it so it isn't green, if wanted.)
If it's intentional, e.g. because you only want a single toolbar when in dual display mode, then for a minimal file display border/toolbar, turn on:
- Preferences / File Displays / Border / Display as a static header
And turn off, in the same place:
- Show file display border in single display mode