I’m afraid that is not possible at the moment. Could you please open a new ticket so your request can be passed directly to the plugin author? You can open a new ticket here: https://support.advancedcustomfields.com/new-ticket. Also, please don’t forget to explain your request again.
For now, you can always collapse the repeater field by clicking the arrow button when you hover the left bar of the rows. That way, it won’t take much space on the backend.
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