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Navigator
Reveals for me with a click. And good thing is not all is revealed unless you click the individual paras.Your content marked with Spoiler appears this way and does not reveals on click.
Chrome on S20FE here
Those are all working fine for me with the dark theme.Switch to default theme. The Dark theme has issues with reaction, edit post and spoilers.
Took a while to get used to the dark theme but all good so far. The only thing that is less obvious is bolded text. So underlining is important