Preview is stuck on Master Style

[teefers (Doug Bennett)]

If I understand what you’re saying, have a look at this post

Can not move from View to Edit mode - Solved

You should be able to view the page list even in preview mode. Try ⌥Opt+⌘ Cmd+L or View menu>show page list or the Inspector button: [2020-12-31_14-03-41]