[X2Go-User] Font size in a 'Single Application'

I have just installed x2go (server on my xubuntu 18.04 desktop, client on my xubuntu 18.04 laptop).

I am using it to run Digikam as a 'Single Application'. I must say it was incredibly easy to set up and get working, congratulations to the developers.

The text in Digikam is a bit too large, i tried increasing the DPI in the session settings but that seemed to have no effect (or maybe it made the text even bigger!). So, is there a way to make the text smaller?

-- Chris Green