If you modify the grid settings in the Grid & Reduced View dialog box and click OK without clicking the Save check box (at the bottom of the dialog box), your new settings become the defaults for your current session only.

If you close System Architect and then open it again, starting a new session, the original default grid settings will be in effect.

If you modify the grid settings in the Grid & Reduced View dialog box and click the Save check box, your new settings become the defaults for all sessions thereafter.