Hello @Anonymous,
You can turn the grid on and off, as well as adjusting the units by clicking on the GRID icon. If you are trying to setup a default, then the best thing is to add a line to your eagle.scr file that turns off the grid and sets the units to MM.
Go to the EAGLE control panel > Scripts and double click eagle.scr this will open it in a text editor. Under the SCH: section add the following on a new line:
GRID MM OFF;
Save the eagle.scr file and close it. Every time you open a new design it will apply those settings to those schematics. If you run into a design that doesn't have the correct settings just click on the script icon on the top toolbar and run the eagle.scr.
Let me know if there's anything else I can do for you.
Best Regards,

Jorge Garcia
Product Support Specialist for Fusion 360 and EAGLE
Kudos are much appreciated if the information I have shared is helpful to you and/or others.
Did this resolve your issue? Please accept it "As a Solution" so others may benefit from it.