On macOS, sometimes the light mode seems too light and the dark mode seems too dark. Prior to macOS Catalina, the dark mode would only affect the titlebar/dock. On Catalina this is not officially supported, but is achievable via a terminal command:
defaults write -g NSRequiresAquaSystemAppearance -bool true
This leaves windows light but turns the titlebar, dock, and sidebar dark. Logout and log back in to see the changes.
To revert:
defaults write -g NSRequiresAquaSystemAppearance -bool false