You can also change the width of your line and make it solid, I use this a lot instead of pen weights as pen weights don’t always show up on the screen
I use 1/2” for most bold lines and 1 1/2” for grade lines but you can experiment
Once you set one line you can use repeat edit to change more
I find if I use pen weights I always miss an edit or something else shows up bold when I print it when I don’t want it to be.
my 2 cents