If you need to delete only one Gateway (either Border or Mesh) from a Deployment plan in the Planning tool, do the following:
Select Connectivity Mesh.
Select the Gateway icon on the map.
In the Edit Gateway dialog, select Delete Gateway.
If you need to delete all Gateways from a Deployment plan in the Planning tool, do the following:
Select Connectivity Mesh.
From the Automated tab, select Delete all Gateways.