Is it just me having dark mode issues when in advanced settings....cant see what is on and off 🤔 also have the same problem when in dark mode and deleting photos, you can't see option to move to recycle bin....have report the issue
Hey are you using a custom theme or something of the sort? Sometimes the issue could lie within the theme you are using. Try switching back to default theme and turn on dark mode to see if the issue persists.
I've been using dark mode on my S21 Ultra from day 1 and haven't had any issues with it yet but have noticed some third party themes could introduce some undesirable effects.
Have you ever had a custom theme installed before? Then probably made some changes on top of it before going back to original theme?
Couldn't hurt to reset the theme back to default if you haven't tried it yet. Enable light theme then return your theme to default. Turn dark mode back on after.
Also on the default dark mode, with no other modifications, your toggles should be blue and not black so there is definitely another customisation going on there. Thus is what is causing the colour clash since black is clashing with black so therefore appears invisible.