Problems restoring errant Tabs/Margins

[WillyGo]

While editing a 500pp draft using NWP 2.1.8 on a MacPro 10.13.2, the text suddenly narrowed to a column one character wide while I was dragging my finger across the track pad to move the cursor. (See image below.) Ctr-Z does nothing and attempts to drag the tabs back to their original positions have been fruitless. How can I restore it?

[WillyGo]

I received the following from Nisus, and their suggestion solved the matter.

I’m very sorry for the trouble. It’s something we’ve seen before, where a laptop’s trackpad is overly sensitive and Nisus Writer incorrectly shrinks the zoom down to some very tiny percent, eg: 2% zoom level. The good news is that the problem is easy to correct: use the menu View > Zoom > 100%, or any method to set the zoom back to a normal level.