It is a lightning component for the developers to use for any scenario where they need to add a multi-select lookup component. It will reduce the efforts of the developer and is also generic.
We show Salesforce accounts that are linked to Trailblazer.me and have the Manage Billing permission. If your account is missing, check that you connected the account to your Trailblazer.me profile. Then verify that you’ve been assigned the Manage Billing permission in the related org.