Exposing custom Lightning components to App Builder
Key Takeaway
A custom Lightning component doesn't appear in Lightning App Builder on its own. A developer must configure it before admins can add it to Lightning pages.
Lightning App Builder lets admins build Lightning pages by placing components on them. It can also use custom Lightning components that developers build with Aura or Lightning Web Components (LWC). A developer's configuration tells Lightning App Builder which pages a component can go on and which settings admins can change.
Custom Lightning components need configuration
Custom Lightning components don't automatically work on Lightning pages or in Lightning App Builder. To make a component usable in both, a developer must configure the component and its component bundle so they are compatible with Lightning App Builder and Lightning pages.
A custom Lightning component configured for use in Lightning App Builder appears in the Lightning Components pane. Admins can add it to Lightning pages from there. Admins set the values of exposed properties in the Lightning App Builder properties pane, without writing code.
Creating a custom Lightning component requires programming skills. An app builder without those skills can instead install an existing Lightning component from the AgentExchange.