What Action Logic can I use to delete an item from a list?

I have a row child query of "site Assignments" that displays perfect but no option in the action editor can I find a way to delete the selected one a user presses on when I select any option?

When I select in the action delete document backend database option for the Generating Children from Variable it end with no option to accept an action. Same when I actually select the reference and drill down to the site assignments. you get in an endless loop of no option to actually delete a selected field so the only way we can update is to go directly into firebase and manually delete.