I don’t know about resizing channels, but there is a bookmark function that might be of some use to you.
Click on the channel name at the bottom of the screen and tap the bookmark symbol to the right of the track name in the window that opens. It should go green. Then you can use the bookmark list on the bottom right of the screen to zap the screen to that channel. You can set up several bookmarks this way.
Hope that helps and that I have described it clearly!