A very simple quality-of-life mod. If you press your controller's "Start" button while naming a monster the "Done" button will be selected. I missed this behavior from other games, particularly on Switch. I've only tested this with a PS4 controller, so please let me know if this doesn't work for your controller of choice and I'll try to make it happen. :)

Source: https://github.com/alexcpendleton/monster-sanctuary-mod-start-button-name-menu-confirm