Not finding a set of themes to choose from (are there any?), I went through Preferences/Colors to get things the way I wanted. My eyes are not good, and light text on a black background is best. Also I like a dark layout.
Everything looked fine until I ran LibreOffice and tried to open a file. The file lists were black on black. I confirmed with Kwrite that this is a general situation.
I tried changing everything in Preferences/Colors, but I could never get white on black in the file dialogs.
Did I just miss the right setting, or is there no way to change the black text in file dialogs?