OK, you changed your mind and wants to go to the previously watched video on your Android App. Here is the solution,
- Tap anywhere on the playing video screen of the YouTube App.
- You will see two arrows, one pointing to left and another on to the right.
- Tap on the left arrow to go to your previously watched video
I hope this information is helpful!
Pro tip: you can access your complete watch history on your Android app and YouTube web if you are in need of going to your watch history.