The headliner in my 2014 LX-S Accord Coupe is starting to come apart at the top of the windshield. I've attached a picture. What is the best way to fix this?

 

Probably taping off the window and the portion of the headliner that is still attached. Then spray some spray adhesive on the foam and cloth. Let setup according to the instructions then stick them together.

I'm also wondering why the headliner is separating. Has the windshield been replaced? Have you noticed any water or dampness in the headliner?