XML Viewer
The XML tab displays the full source of the loaded URDF file as plain text with syntax highlighting.

Overview
The XML viewer is read-only. It lets you inspect the raw structure of your URDF without risk of accidental edits. Syntax highlighting and styling are applied automatically using a SwiftUI code editor package.
Theme Selector
A Theme button at the bottom of the screen opens a theme selector, letting you choose a color scheme for the syntax highlighting.