It is worth noting though that this workaround has a downside: it is not possible to create automatic grids/graticules for these maps. Voilà! Both maps appear are nicely circular. That’s why I set the symbol fill to black and used the Lighten blending mode: Note that the effect only works if the symbol itself is not transparent. In particular, I created a big outer glow effect: An alternative, which doesn’t suffer from this slowdown is using draw effects: But this solution slowed the print composer down a lot. I’ve evaluated to workarounds: First, I created a style with a wide white outline that would cover all map parts outside the circle shape. The main challenge when creating the mask is that there is no inverted polygon renderer for shapes in print composer. To create a circular mask, we can add an ellipse shape: Since we cannot change the shape of the map item, we have to use a mask instead. The detail map on the other hand is rectangular by default: Since the map of the full extent of the dataset is already clipped to a circle, the overview map is easy to deal with. Quantarctica project with some custom styling
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