Lightning page component visibility rules
Key Takeaway
A visibility rule keeps an item on a Lightning page hidden until its filter criteria are met, but hiding a field doesn't remove access to its data.
Component visibility rules let an admin control when a component, a Dynamic Forms field or field section, or a tab appears on a Lightning page. One page can then change what it shows based on the record's data, the viewing user, or the device.
What a visibility rule does
A component with no filter displays as usual. After you add one or more filters and set the filter logic, the component stays hidden until the filter criteria are met.
Filter logic sets how multiple filters combine.
For example, imagine an item with two filters. If you choose "Any filters are true" under "Show component when", the item appears when either filter is true.
When a user saves a record and the filter criteria become true, the page updates to show the component without a refresh.