To edit a map, open it and click the green "Edit Map" button (Cartographers only). The edit form has the same fields as creating one — rename it, move it between folders, adjust the grid, swap the image, change tile orientation and size, and toggle the color overlay or tile codes.

For image and tile tweaks, there's a faster route: the orange cog button on the map view opens a live Map Settings panel where you can nudge the image's width, height, and position, set the tile orientation and size, and preview as you go before clicking "Save Settings" (use Reset Size or Reset Position to undo). Reducing the grid hides tiles that fall outside the new dimensions but doesn't delete them.