[QFM]

Hey stevland,

Thanks for your fast response!
I solved it. You gave me a new idea to think about that issue.
Its not completely tested but it does the job for now:

Possible Downside: I think it affects all Dropdown Menus. (But until now, not a Problem for us) 

I just added the following to my Custom CSS Code:

.select2-container--default .select2-results>.select2-results__options {max-height:100%}

Again, its not really tested and im going to discover if its the best choice to just set the height to 100%.

But the idea should be clear. 

 

Thank you again for your fast Help. Have a nice day!