Unable to remove cylinder

[gmls]

Hello

I am unable to remove the cylinder of my sliding door, there is no bolt in the front of the lock
Tried pulling it but doesn't help, removed both screws on the lock to see it is a removable front plate where the bolt is hidden behind but that doesn't work.
the are some pins in the front plate so I think it does't come off.
Also looked if it is a scandinavian cylinder but then there would be bolts on the cylinder

Someone has an idea how to do this?

 

[crank39]

Look through the hole in front of the lock where you say there is no bolt/screw because some mechanisms require the screw to be sunk below the faceplate of the lock, a screw with a head won't allow that so a long grub screw is used instead, look to see if you need a small Allen key