Custom actions are not available in the Essentials solution.
If you are looking for a way to remove users from all AD groups, you can use the following script in a CoreView custom action:
{
"id": "2d260602-3ce4-484b-96d5-e08ade0bef3b",
"title": "Remove all AD group memberships v3",
"description": "Script will remove all AD group memberships for 1 user",
"lastModified": "2022-04-22T13:56:44.0380000Z",
"target": "None",
"tags": [],
"vars": [
{
"name": "SAMAccountName",
"type": "string",
"isRequired": true
}
],
"params": [],
"columns": {},
"version": 4,
"statement": "param ([string]$SAMAccountName)\r\n\r\n$members = Get-ADUser -Identity $SAMAccountName -Properties MemberOf\n\n foreach( $group in $members.MemberOf){\n Remove-ADGroupMember -identity $group -Members $SAMAccountName -Confirm:$false\n\n }"
}