I often align horizon lines of design to parallel window edge. Sometime it fix, but sometime I’m hard to match, please put an grid option.
Thank you.
This has definitely been requested before a few times, so I’m going to upvote the existing feature request through your behalf. 
Upvoting this
Just to make sure you’re aware of this workaround:
And thanks for your upvote, in this case users are able to forward their inquiries themselves using our portal. So feel free to submit it as a “new” idea via the top right button and internally, we’ll then add the “upvote” to the corresponding topic, all through your name which is ideal for us.