Then select a theme. Currently the following themes are available:
Neox
Override this theme
To quickly test something, you can also override this (or any other) theme in your personal config file. Please follow the guide in the color theme documentation.
UI: For all changes to the "outer UI", like (status bar, file navigation etc.), take a look at the Theme Color reference.
Syntax: For changes to the "code highlighting", examine the syntax scopes by invoking the Developer: Inspect Editor Tokens and Scopes command from the Command Palette (Ctrl+Shift+P or Cmd+Shift+P on Mac) in the Extension Development Host window.