Save and back up, then open the top bar menu and choose Legacy Selectors.
Click Convert to New Format, inspect the new Default collection and responsive values, and save.

Current Breakdance editor on a site with legacy selectors, Convert to New Format outlined with yellow highlighted pointer

Conversion transfers names, supported properties, and responsive values, removes converted legacy definitions to avoid duplicate output, and retains elements/class assignments. The menu appears only while legacy definitions exist.

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