In QGIS 3.10.3, I'm trying to figure out how to use the Union tool without the optional overlay layer.

When I go to "Vector > Geoprocessing Tools > Union..." and bring up the tool, the description says the overlay layer is optional, but the field is already filled in and I can't for the life of me figure out how to clear the field and run the tool without the overlay layer.

1 Answer 1


If you scroll the overlay layer dropdown menu you can choose an empty value (in first position). Result will be an union between self intersections of the source layer entities.

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