I noticed this as well!
It seems as though the mobile version hasn't updated yet, but the desktop version is showing the changes for me. I'm not sure if this was here before, but I noticed a "creators 101" tab on the top bar which sends you to a bunch of quick links regarding webtoon tips and webtoon creation.
Either way, I'm really indifferent with the new "Canvas" title. I don't think there was any need to change it in the first place, but I don't think it's as negative as everyone is making it out to be. It's just another label, and people can read into it as much as they like, but I'm quite sure readers are smart enough to figure out it's an area for unofficial comics within a minute of exploring the page.
Edit: The update just hit the mobile version. While not much has changed, they seem to have added a "Find your Favorite comic" survey that allows you to select your favorite art styles and genres in order to find a comic that suites your tastes. However, it only recommends "Original" (cough featured cough) comics and resets after you're finished. It also added the creator 101 link in the canvas section of the app.