Problems with creating PDF in layout

What I do not understand, I draw my 2d model in SU 2018, import it into LO and it looks blue. For sure not black. I didn’t think it would be a problem until I exported it as a PDF. The drawing is unreadable. What did I do wrong, and how do I fix it?
I tried to upload the LO but it’s too big - I forgot how to upload it. Can you remind me? Thanks G
driveway 2.pdf (268.1 KB)

When I look at your PDF I see nothing unusual.

Is the detail drawing a coarse raster image or are you using Low export resolution?

Wow. I drew it on my laptop which is underpowered for use with layout - there are lags after executing commands. I just opened the file on my desk top and it looks normal. I never would have suspected the laptop monitor isn’t displaying the pdf correctly. What you show looks great, but when I view the pdf on the laptop it lacks clarity. The lines are skinny, partially displayed.

Maybe the adobe reader settings are messed up. I wonder how I fix that? As I looked to find the computer specs it says the flash drive removal update, whatever that is, hasn’t been installed. Could that be the reason?

My laptop is a Lenovo G50 with AMD A8-6410 APU 12 gig of ram,(11 useable) Radeon R5 graphics 2.00 ghz

Thanks, G