The blend mode “screen” works as a reverse version of “multiply” (but the mathematics are more difficult to understand): Your image becomes lighter. So it could be interesting to use this blend mode to assist in lightening shadows, which is something you do often.
My idea is to enable modules you will use anyway and select blend mode “screen” instead of “normal” and watch the results. Just turning on “exposure”, “levels” or “tone curve” with default settings does not change the image, but changing the blend mode from “normal” to “screen” does.
Below you find some results of my experiments with the same image. All settings are default unless otherwise noted.
Shadows and highlights enabled
Exposure enabled, blend mode screen
Tone curve enabled, blend mode screen
Exposure and tone curve enabled, blend mode screen in both modules
The difference between 3 and 4 is caused by the modules being executed either before or after the base curve module.
In this case I personally prefer the result of lightening the shadows with the exposure module compared to the shadows and highlights module