Brand New, Need Help With Straight Lines

Hi I just started using Zbrush and am trying to sculpt a high poly mesh for the first time but having troubles making straight lines. Everywhere says to just hold shift, but when I do that it locks my cursor at a random angle. It doesn’t give the straight line preview like I see in videos or let me even pick the angle. Right now I am setting my stroke settings to backtrack > snap to track > line and that helps let me choose my angle and preview my stroke, but its really annoying having to keep changing the setting every other stroke. I am using ZB 4R7 if that makes a difference. I don’t know if they changed it with 4R8, but there has to be something I’m doing wrong. Any help is much appreciated.