Fuji Transonic 2.8 2016: rear derailleur hanger direct mount or standard?
TLDR: You have a standard mount hanger, leave the B pivot on the derailleur.

Looking at this Wheels Manufacturing page, what they call 'direct' hangers put the M10 mounting hole further to the rear than 'standard' hangers.

I believe that with the newer groupset series that introduced 'Shadow Technology' (moving the derailleur in and behind the cassette a bit) Shimano wanted the B pivot further rearward than previous designs and added the B-link to do this. They provided for original bicycle manufacturers and third party hanger manufacturers to make 'direct' hangers by making the B-link removable. 

If your hanger goes straight down it's a standard type, use the B-pivot. If your hanger goes down and rearward at about 45 degrees, and there is a horizontal separation between the axle and M10 mounting hole of 1-2cm it's a direct type, remove the B-pivot.