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After removing Member sub grid on Marketing list form, there is no way to get it back
The only solution is to export a solution from a vanilla org which contains marketing list form > import in the affected org > create a new form.
There should be an option on Marketing list editor form, to add a sub grid under insert section.
For more info refer --> https://community.dynamics.com/crm/f/117/t/182322
STATUS DETAILS
Declined
Administrator on 5/10/2023 2:53:03 PM
Thank you for submitting your idea to our ideas portal. We appreciate your contribution and the time you took to share it with us. We have shipped many enhancements since this idea was posted and it is likely that it has been resolved. If not, kindly reopen. Thank you again for your continued support.