Themes and extensions
Quark’s development source includes four themes: Graphite, Aurora, Dawn and High Contrast. Use the Themes view to find and customise them.

This is an earlier development screenshot; the native frontend may use different controls.
Add an extension
Section titled “Add an extension”Quark’s extensions use local plugin.json files to describe commands. They are not VS Code VSIX packages.
Use the extensions interface to discover your plugin folder, put an extension in its own subdirectory, and Reload. Actions you explicitly run send output to the Output panel.

Development-era screenshot.