How can I prevent/disable new rows from being added to a subform (hide the Add + button) when editing an existing record?

Hello, is there a way/rules to hide the ability to add a new row to a subform when editing the current parent record? Classic page (version 1).

The only thing I found was to disable the “Allow multiple” option, but I’m not entirely sure that’s the right solution.

Because when adding a new record (and in general for storing information), I need multiple records in an associative collection. Will records already entered in the subform be deleted after saving or other actions? Or is this exactly what I’m looking for in this question?

Hello, custom settings for adding new operations to subforms are now supported in version v2.

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@hongboji, thank you for your reply. I’ll keep that in mind, but for now I’m using version 1 Classic because it has enough functionality for my work. Version 2 Modern is unfortunately still in development mode, and I don’t have enough functionality there. I hope that Version 2 will soon have at least similar (or even greater) functionality as Version 1.