Dear @mariusjopen
It’s been a time, but I want to get back because I am facing this issue again.
I think you misunderstood me here. I wanted to request a feature with the post. :)
In the admin panel under the menu item "Lay Options" → "Cover Options" is the setting "Darken Cover when scrolling down".
This option darkens the cover region from 1 to 0 via the CSS filter brightness in realtion to the scrolling depth.
My suggestion was to add another option to the "Darken Cover when scrolling down" option alternatively or in addition. For example "Change opacity instead of darken the cover region".
The only difference is that now instead of "filter: brightness(var)" "opacity: var" is changed inline.
This would extend the possibilities you get with the cover option:
For example, instead of darkening everything, you could hide the background image of the cover by the opacity loss. Or a color could become visible. etc.
I don't know if you are open to suggestions for improvement... If so, I hope this is something other users are also looking for.
Thank you! Best