What if your terminal couldn’t scroll back? When I just started using Tmux I didn’t know how to scroll back so I used to run Rails Server in a seperate terminal.
When I finally figured out how to scroll back up I also learned the hard way that you have to scroll down or otherwise your Rails server (and the whole app) will hang.
There are 2 ways of scrolling in Tmux. You can configure them in your .tmux.conf and they can be used together.