@duns I found a workaround, changing the text color in my color-scheme (all KDE theme) from white to black.
However I wonder why Clementine hadn't this problem...

@CherryStraw thank you. But besides Fusion I have only another one theme, Windows theme, that doesn't have this problem, but it is quite ugly
How could I get other available themes?
I noticed that installing a new application style on my linux (KDE Neon lts) didn't provide a new theme in Strawberry...

Or what other solution?

I tried today Strawberry (a great idea a fork of Clementine), but I found a problem with Fusion style: I cannot see any menu text in file information. You can see in the attachment.

How could fix this problem?
Plugins? New themes?

Thank you!