From the GW2 forums after the OP laments the implementation of Vistas:
Source: https://forum-en.guildwars2.com/foru...oration/page/1We’ve implemented a Legend on the World Map. If you open that up you should see a little Eye icon in the bottom left hand corner. Click that, and if you uncheck “World Completion” it’ll remove all the Map Complete markers from your map except Waypoints. -- Crystal Reid
I like it! But I dunno if I will do it! lol