I would like to hide the + and trashcan buttons in the table on an adaptive form.  I want to add a button at the bottom of the table that says 'Save and Add Row'.  How can this be achieved?

This seems like it's possible to do... 

this link : https://help.adobe.com/en_US/AEMForms/6.1/DesignerHelp/WS92d06802c76abadb-5ec05741129b8b006dd-7fec.2...

seems to show it being done, but in an older version of AEM... I'm on 6.5.5

this also seems to show it being done if you scroll about 2/3 of the way down: https://github.com/AdobeDocs/experience-manager-65.en/blob/master/help/forms/using/adaptive-forms-ta...

to the 'Merge data in a table {#merge-data-in-a-table}' section.

I just see no indication of how this is achieved.