Illustrator for IPad - half of the text in my projects suddenly invisible

I'm super new to illustrator and am just using it to make my own wedding invites, etc.  I will be the first to admit I have no idea how to do what I'm doing efficiently, but I had my invitation almost completely finalized when I went back into the project tonight. However, when I opened the project and tried to zoom in, I don't know, maybe I clicked something, but half of my text just randomly disappeared/became invisible.  I checked all my fonts, and they're still downloaded to my device.  I checked my layers, and the text is still there, just invisible...When I try to add new text in and change the font, the program won't let me do that either. It's bizarre. I clicked through my other projects and now they're all doing the same thing, which makes me think I must have inadvertently changed some setting and can't figure out how to change it back. I deleted and re-downloaded the app hoping to reset it...didn't work. I have no idea what I did. Please help! I included some screenshots of how the invite is supposed to look/looked before I did this (private info. redacted) and the layer view of what I see when I open it right now...the text is still there, just invisible. How do I make it visible again?