Clicking ‘Save Changes’ in the modal footer is your master control. It saves the settings from all tabs at once, including:
To ensure you always save intentional, complete schema, the 'Save Changes' button is **activated only after you have visited the 'Visual Builder' (Tab 2) at least once** per post.
This is a safeguard to make sure you have actively selected a Schema Type (like 'Article') before your settings are published.