I need only 1 centroid point for the whole layer (more than one polygon) instead of 1 centroid point per feature that you get with the menu -> Vector -> Geometry tools -> polygon centroid tool. Its position doesn't have to be based on area or weight of any kind.

  • 2
    Make union -> take centroid. – user30184 Jan 25 '19 at 15:24

With a virtual Layer you can do it like this (same as user30184 described in his comment):

select st_centroid(st_union(geometry)) from my_layer

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