6. Merge Multiple Features Using Dissolve

  1. Select the polygon features you want to merge using the select tool.


  2. Hold down shift and do a multi-select.


  3. Go to Vector -> Geoprocessing Tools -> Dissolve


  4. In the Dissolve window, choose the right layer and tick “Selected features only”. Click “Run”.


  5. The merged polygons will be stored in a temporary layer called “Dissolved”.