Did you mean to post this question in the AEM forums?
I'll move the post to that community.
Some options in the action dropdown field in advanced tab are present under the path '/libs/foundation/components/form/actions' in crx/de.
Custom action can also be added to the dropdown list by creating the sling:Folder node with sling:resourceType 'foundation/components/form/action' under apps.
Refer this link to create your own custom action