Uninstalling Map My Relationships solution from your CRM environment is quite simple. Just follow the below process to uninstall Map My Relationships from your Dynamics 365 CRM.
1) Navigate to Settings ->Customizations ->Customize the System.
2) From there go to Entities ->Account ->Forms ->Select the respective ‘Form’ for which controls are set.
3) Double click on Form ->Click the field on which control is set.
4) Now go to Controls -> Delete Map My Relationships Control -> Click OK -> Click on Save and Publish.
5) Next, navigate to Settings --> Solution --> Select Map My Relationships solution.
6) Click on delete button. A pop-up will appear asking for your confirmation. Click on OK and the solution will be uninstalled from your environment.