For pretty much every default wallpaper and the LCARS theme, the title on the upper menu bar is unreadable from normal distance away from the monitor.
I dont see a way to easily change the font separately from the entire theme, so my suggestions for improving this are the following:
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Make the titlebar dark to match the dock at the bottom
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Black or white border around the text so the same colour is readable across multiple backgrounds
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Allow changing of the font colour separately from the main theme
System details: OS: Arch Linux 7.2.7-arch1-1 DE: KDE Plasma 6.7.5 (Wayland) CPU: AMD Ryzen 7 5700X3D (16) @ 4.15 GHz GPU: AMD Radeon RX 7800 XT [Discrete]
I think 3. is most promising option. We should be able to compute a value that "automagically" has good contrast against the bar background, and apply the same to the title bar of views.