Jagged Lines

I have seen some jagged line posts, but none seem to be similar to my situation. I am making a mark and I have smooth vector lines, yet the edges appear jagged (image below). This is the first I have noticed it and I have not updated or changed anything on my computer or program. I'm using Illustrator 27.0.1 on macOS 10.15.7. How do I fix this? Will it print with the jagged edges (my hime printer is down)?

Thannks, Greg