Export to FBX not available for some unknown reason (to me) most of the export options with the file I am working now dissapeared. But with other files all export options are available. Is it a bug or how could I enable it for my working file???



in the same working file, if I switch to Layout mode the export options are back, and if I switch to modeling the options disappear again, is that intended?

Edit.. this behaviour happens only with my working file, with other files I have all export options in Modeling and Layout modes
I'd start with your user preferences. FBX import/export is an add-on there.