There are two links in a control panel on the left hand menu section. Link 2 is clear to see, but Link 1 is above it and hidden by the top menu section.
It was fine when I created it, but when I left the page to create a new form and then came back, it was as you see it below. You can just make out the dotted curvature of the link outline in this screenshot :
Needless to say that I can’t scroll up.
edit - if I double click the portion I can see of Link 1, then it resets itself properly and the links are both showing as they should do in the designer.