@ProDesigner When I draw with the pencil tool, after I lift my pencil the lines move around and become more simplified instead of the way I actually drew them. This feature is usually called line smoothing or stabilization in vector software. Even though I found this option in Affinity Designer, turning it off doesn't actually turn it all the way off. It just makes it do it a little less. This feature can be awesome for drawing to help you get nice clean lines, but it can become problematic if you are trying to do work where the lines need to remain exactly the way you drew them.
This is specifically an issue with vector lines and not pixel lines. Switching to pixels is not an option for me. I want my final product to be scalable at many different sizes.
After starting this topic, I found this longer discussion which is about the same issue I'm describing. Apparently this isn't limited to the iPad version. It's unfortunate because it means I won't be able to use Affinity Designer for this project, and I really wanted to. ☹️
As an addendum to the first post, I won't be using Adobe Draw either. I quickly found out it uses a brush stoke like the blob brush in Adobe Illustrator instead of making vector lines. I found a free app called Vectorinator on the app store that has a pencil tool that draws vector lines where the smoothing can truly be turned off.