Coord info toggle, unsymbolized features, sublayer removal, disabled layer types, theme, highlight color, and service URL overrides.
Test plan: 18-global-settings.md
Default theme. Coord info visible. Sublayer removal allowed. Highlight layer available.
Dark backgrounds, light text, correct icon colors.
Light backgrounds, dark text.
Government of Canada Federal Identity Program colours and Helvetica typography.
Click a feature — highlight should be red instead of default aqua.
globalSettings.displayDateMode set to 'iso'. Click a feature with date fields to see ISO-formatted dates in details/data table.