Problem: ArcMap Merge is greyed out when trying to merge arcs or polygons

Description

When editing a layer in a coverage with topology, arcs or polygons cannot be merged because the Merge option is greyed out.

Cause

Merge is restricted to coverages without topology.

Solution or Workaround

• To merge two arcs together, when topology is present:
  
  Select the shared node with the Shared Edit tool
  

  Shared edit tool icon is on the Editor toolbar

  
  
  and delete it.
  
• To merge two polygons together, when topology is present:
  Select the shared arc with the Shared Edit tool
  

  Shared edit tool icon is on the Editor toolbar

  
  
  and delete it.