I've been running octoprint for a while now, but I'm not able to reach it when I'm not connected to my home network. I think I saw some settings regarding this when I ran the setup wizard, and I'm pretty sure I said I could only access it through my home network. Is it a way to change this setting, without running the setup wizard again?
I've looked through the settings, but can't seem to find it.
You really don't want to do this. See https://community.octoprint.org/t/why-is-it-unsafe-to-open-octoprint-to-the-internet/9229 and the links in that thread. Also https://community.octoprint.org/t/octoprint-hijacked/9905 for an example of how even a supposedly safe connection can go wrong.
There are, however, some plugins in the repository that will send status to social media applications like twitter, discord, etc. Note this is not control but it is safer.