u/Zetzatoon

So I'm brand new to Adobe animate and I was trying to drag the frames around to rearrange them and instead this happened and it gave me a yellow line next to the frame and when I tried to control z my way back it wouldn't go past this point, can someone tell me how to reverse this and what this is and how do I rearrange the frames, I'm sorry if this is a dumb question but I'm new to this 🥲