The graphical listener can be styled in a few ways:

1. Using the ui.theme vocabulary to control the theme colors.

2. Setting the interactor-font to control the font used for rendering, as well as the listener-word-style which styles triggered commands and listener-input-style which styles the previous input lines.

3. Using set-listener-font to change the font of the open listener (applied to subsequent output lines).

Typically these settings all affect new listener sessions, or output. If you want them to be saved, you can add them to your ~/.factor-rc configuration file.