Nice and clean, empty, and gray. In this new file, changing the End frame of the Timeline also sets the Frame Range End under Output Properties, and vice versa.
I was animating my character and was stashing each finished animation (or pushing under a new NLA track). I only recently learned you could do this and am still not entirely sure how it works. My dope sheet was acting completely as expected, until I accidentally hit something and my track turned orange:
I'd like to be clear I'm talking about the dark orange background, not the orange of the selected keyframes. This dark orange background persists regardless of what animation, object, bone, or action I have selected. I can even make an entirely new action and nothing changes. The only changes in functionality I have noticed are that now, I have to set both the Frame Range End and the End Frame manually to match. Also, suddenly no keyframes show up on the Timeline unless I uncheck the "Only Show Keyframes from Selected Channels" setting. Having to constantly switch between menus and being forced to work with all keyframes all at once has really slowed me down and it's driving me up the wall.
Does anyone know what I did on accident? I would really love to revert it so I can work more intuitively again.