There is a special "unanswered" list which can be sorted by date: https://tex.stackexchange.com/unanswered/tagged/?tab=newest
For everybody who is like me hiding the left hand sidebar, this can be hard to find as it hides behind the three horizontal lines at the top left of the headline:
If I remember correctly there are some differences and the ...
There are buttons at the top right corner of the answer area for sorting
by latest active
by age (oldest first)
Perhaps you clicked one. If you don't see the buttons, try with a different browser. Click on "Votes" to revert to the original sorting by points (votes).