It’s good news for all you Mario Maker course designers out there, as the game will now let you upload 64 courses rather than just 32.
You can find the notification about the increase in the “News” tab while in game, which looks just like this.
At the beginning of the month, Nintendo announced over 2 million courses have been uploaded already, and considering how successful Mario Maker 2’s release has been, it can’t be long now until that figure doubles too.
Source: Eurogamer Mario Maker 2's course-upload limit has been doubled