On my V30, I use the factory launcher, "home & app drawer".
The theme is the default LG theme.
Lock screen and home screen are using two beach volleyball photos I took (summer, fairly bright).
I have the "comfort view" set to the schedule 6pm to 6am (reduces blue light).
I have the "screen color" set to best-for-pictures, which seems a bit warmer than the "normal" setting.
I use the "auto brightness". Depending on what I am watching (pictures/movies), I may adjust the brightness up a little. I have not noticed any problems in bright sunlight yet, but winters in Seattle tend to be rather cloudy.
In the Developer settings:
Show touches = on. It can help to see where my fat fingers are registering.
window animation scale = 0.5x (speeds up the animation)
transition animation scale = 0.5x (speeds up the animation)