Have you tried using the SET FOCUS form rule?
Dear Phil, Thank you for reporting this issue. We were able to reproduce the problem when the “Maximum number of rows in edit mode” parameter is set to 0 while the options to add/clone/delete rows are disabled and the action column is turned off. We confirm that this is a bug, and a fix will be
Dear Patryk, Thank you for reporting this issue. The described behavior is a bug in the current version. The problem has been identified and will be fixed in one of the upcoming releases.
This bug has been fixed in version 2021.1.4. Best regards, Rafal