Modul Parameters (e.g. Border, Padding) in Top Menu Style have no effect

Hi,
using Joomla 5 with Cassiopeia and Jux Mega Menu 3.4.6. I want to change the border and padding of the Top and Sub Menu by using the parameters Border, Padding etc. in the modul. But the input shows no effect.
What is going wrong?
Is there a conflict with Cassiopeia?

Thanks for support & Regards