How can I remove "Move window to next monitor" button?
This is ugly

Right click on a DF taskbar and choose Settings.
Click on The Functions Tab on the left.
Highlight the Move Window To Next Monitor function and you will see the icon highlighted below with a X click box. Click on that and then OK and it will no longer show. There is a checkbox on the same pane if you want to hide all the icons as well.

oh my goodness. thank you. that was driving me mad.