This is one of the features of Azure Data Studio that is great for accessibility as well as just being cool.
The default theme is your basic light theme. It’s fine but this isn’t the only theme you have to use.
Use Ctrl+k Ctrl+t to open the theme options.
Have a click through and see how they look when you’re editing code. It’s a case of choosing something that suits your style. My preference is the default dark theme but go nuts and choose one you like.
Oh, and if you’re a sadist, check out the Red theme