Dynamic Actions and visibility filters
Key Takeaway
With Dynamic Actions, a record page's Highlights Panel actions come from Lightning App Builder instead of the object's page layout, and each action can have its own visibility rules.
Dynamic Actions let an app builder manage the actions in a record page's Highlights Panel directly in Lightning App Builder. Visibility filters show or hide each action, or each component on a Lightning page, based on things like a record field value or the user's device. The result is a page where users see only the actions and components that fit the record and the situation.
Where Highlights Panel actions come from
Without Dynamic Actions, the page-level action menu in a record's Highlights Panel comes from the "Salesforce Mobile and Lightning Experience Actions" section of the object's page layout. The actions appear in the order listed there.
With Dynamic Actions, you add, remove, and reorder those actions in Lightning App Builder. You can also give each action its own visibility rules.