[Geoff Bacon]

Just tried another experiment

Dark Mode Off, Night Mode Off

Dark Mode On - library changes, Songs as normal

Night Mode On - both library and songs are changed

Settings, unchecked dark - library and songs still dark - I would have expected library to have reverted

Unchecked Night mode, normal library and songs
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Dark Mode Off, Night Mode Off

Display Song and Choose Night Mode
Back to library screen - this is dark
Settings Dark Theme is not ticked
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This is probably how you want to display but I would have expected 3 states for Dark Mode (equivalent to off, ticked and implicitly ticked). This would make Dark Mode consistent with how the library screens are displayed (but no idea what you do if someone unticks an "implict tick")

Anyway, my problem seems to be resolved

Many thanks
Geoff