There should be a numbers page above the threads index that you click into. I know what you mean, I do prefer it when when it was all more together
but now ATS is a lot bigger and seperated than it once was.
My one has page 1,2,3,4,5 etc and a red customise link. Maybe you accidently touched that and you only get one page. Go to options on ATS where ever
they are in your personal ATS section or what ever sections there are.