I need to change the line weight from mm to inches, but it just won't change. It's for school and my teacher knows almost nothing about cad. I don't know why he teaches this class.

Things I've tried already

1. typing MEASURE into command and setting it to 0. It was already set to 0.
2. typing LWEIGHT into command and setting it to inches. doesn't seem to do anything.
3. typing UNITS into command and changing it to inches. still doesn't do anything.

I am running AutoCad Lt 2016 on Mac

here are some photos of the settings.