Is your feature request related to a problem? Please describe.
My eyes are older and I'm frustrated with the lack of contrast on the light setting. I prefer a light background, but am using the dark setting so that I can read the results.

Describe the solution you'd like
I'd like more control over the settings and to have an understanding of what the settings do. On my MAC (using the app), I figured out how to get to advanced settings so that I can control them using JSON. I see the ITheme interface. It gives me various properties I can set, especially with "colors" and "editor", but for many it is not obvious what they apply to. For instance, color.offBg or color.tertiary. I have guessed what these do, but have ended up just spending a lot of time trying things with frequently unexpected results.

In addition, I use the altair-graphql-plugin-apollo-tracing plugin. It seems to want its own colors, which only really work with a dark background, so if I'm using tracing, I'm forced back to the dark background to be able to fully read the results.

My request is for better documentation about what the ITheme interface properties control, and the ability to control these for plugins, such as for altair-graphql-plugin-apollo-tracing. I'm happy to use the advanced configuration, but some understanding of what things control (beyond a simple property name that I have to guess at) would be helpful.

To be awesome, changing the display as you edit in advanced mode would speed things up. Right now, I have to hit Save each time to see the effect. If this was done, the result should revert back to the starting colors when the setting are closed unless Save was applied.

This is all a nice-to-have, but it would make this great tool easier to use for those of us with aging eyes.