Action Editor - Keyframes Invisible?

Hello, I’m trying to learn how to do animation with Blender. Problem is that something happened to my one project where all the keyframes had just disappeared on me in the Action Editor. I can still change the frame and the animation will change just like I had originally set it up, but the keyframes aren’t showing up. I looked all over the place to see if I just accidently hit some option labeled “hide keyframes” or some such option and googled the issue to find relatively nothing that fit my query. Does anyone know what could cause my problem to happen?