I installed the plugin KoboTouchExtended, disabled the plugin KoboTouch I had already installed and uploaded the e-book. Indeed, the ref is now much better selectable (the pop-up is a nice feature), but ...

The overall margin is increased, even when I specifically set the kobo margin (in reading settings) to 0. This causes the chopping of of 1 rightmost character on every line. There seems to be no other setting on the kobo itself of with the plugin to resolve this. Any ideas?