Yes, we can show connections in Map My Relationship control. You would need to configure the control by adding a appropriate 1:N relationship name.
Yes, it is possible. We can show 1:N, N:1 and N:N related records in the Map My Relationships control.
Once the solution is imported, please follow the below steps to activate all the processes of Map My Relationships.
Click on the gear icon --> Select Advanced Settings.
Next, select Processes.
From 'All Process' View activate the process shown in the below screenshot:
Map My Relationships works on dataverse and customer engagement environments. In PowerApps, it will only work for Model Driven Apps where we have entities. Also, Map My Relationships can be installed on an environment that does not have Dynamics 365 CRM subscription i.e. CDS environment.