I started with the Natural earth admin 0 - Countries vector layer. Based on this, I created a new layer (using the 'Collect Geometries' tool) that only contains 26 features, representing major world regions (colors in the figure show regions; in this example North Africa has been selected and is shown in yellow).
Now I would like to get rid of the country-boundaries within the regions. Is there a way to only show the outer boundaries of each feature? Or another way to accomplish what I want?
Map of 26 world regions; each region is a feature in a new layer based on classifying countries in the original layer as belonging to one of the regions