Publish | Landing Page

When I go to my Obsidian Publish homepage, there is a page that says “Welcome To” and nothing else. How do I control the landing page for my obsidian publish page? I grep’d around my vault and there was no markdown file containing welcome to…
Sorry for the amateur question, but would love to go to my directory and see (e.g.) my main.md file and not a blank mystery file. Thanks!

(mostly) SOLVED!
Publish (paper plane icon)>settings>manage homepage, can set the file from there
Still no idea what the previous mystery homepage was, but that is very low priority. It is working now. Sorry about that!