Open Rhino, go to Rhino options, under Document Properties click to grid. Uncheck Show Grid Lines and Grid Axis(if bothers you). Close Options and save as template, whichever template you have already. Also define which template load when you open Rhino. Normally Documents Properties needs to be saved in your template if you use the same setting, also if you open others file then import instead open and that way the file will load with your settings. I hope this helps. I have a pretty good template in inches with very good image quality, if you want to try it then email me.