I'm trying to make a hex grid net with the shape of polygon. Unfortunately, the grid net is in the rectangle shape (see the screenshot).
Any advice how to do it?
An alternative to @csk's answer is to use Vector > Research Tools > Select by Location to select the hexagons which intersect the desired polygon, and them save them to a new layer. This will mean that entire hexagons will be retained, even if they only partially intersect the source polygon.