It took me a while but figured out how to add space between line items.

(I'm on a Mac using QB Online with Safari)

At the bottom of your previous line item, hit Return to add a line space then type Option-Space.

I did that a few times between line items and now I have the space I need so my client can actually read the estimate (She specifically requested space between the items since she couldn't process the information).

Not sure how to do this on a PC but I'm assuming it's very similar, like control-space or whatever.

This doesn't absolve Intuit from its negligence. I read this entire thread that started 4 years ago and they still haven't provided a simple fix? Come on kids......