Continuing the discussion from Why is the Ignition Designer UI so outdated?:
Kind of an aside but chances are your monitor is set too bright. If it's much brighter (or darker) than your surroundings, you'll naturally get eye strain. Dark mode is just kind of a roundabout way of saving eye strain by reducing overall pixel brightness but not every program supports it (as we're discussing here), and the eye doesn't actually like bright text on a dark background that much so you pay for it in the long term. (also unless you have an OLED or similar monitor the backlight still stays on so it's not as effective)
I work with white background for everything all day every day, but because my monitor is set to about the same brightness as a piece of paper lit up by the windows in my office, it's never an issue.
If you work late into the night with dim lighting, brightness should come down to match (or preferably, a desk lamp should come on as once again, screen too dim means poor contrast).
That's before getting too far into the rabbit hole that is lighting and monitor temperature, f.lux, etc.