Travelling from an Illustrator background I’ve been surprised and disappointed that I’m unable to create a line horizontally, vertically or at 45deg. I believe it would certainly help many.
Hi @JohnL and welcome to Vectornator Forum. In vectornator you can use the grid tool. I advice you to take a look at Vectornator Grid - YouTube.
You can also use the guide Snapping to guide - Vectornator Learning Hub.