Can anyone give me an idiots guide on how to edit a size?
If people are hating the over aggression try the islands setup on create game I went with, you'll have the odd war but with separation it's much more sedate.
Seems it's as straightforwards as editing a text file. It's always smart to make a copy of these files saved as "Maps.xml.backup" or something similar just in case you ever need to go back to the default settings.
1) Open up the folder which you installed Civ 6 into. For Steam this will be [Drive]/Steam/steamapps/common/Sid Meier's Civilization VI
2) Inside the Civ 6 folder navigate to Base/Assets/Gameplay/Data. There should be a load of text files in there.
3) Find the text file called "Maps.xml", right click it and open with Notepad.
4) Near the bottom of this file there is a row which starts with "<Maps>" and then has six rows with "<Row MapSizeType=" followed by "MAPSIZE_DUEL", "MAPSIZE_TINY" etc.. These are the presets for each map size you can select when starting a game. Scroll across until you see "GridWidth="X" GridHeight="Y"". These are the width and height of the map, change them to your desired values, then save and close the file.
A few people have said that changing these can drastically increase the time to generate a map.
I hadn't thought about the island thing, I normally loved tiny islands but the districts system could really screw that over. One thing I kind of like about Civ 6 is that it is forcing me to try out new things e.g. building more cities and not being so damn isolated on islands.