Document Options
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Options specific to the active schematic document are defined in the Document Options dialog, which can be accessed by choosing Design » Document Options from the main menus.
This dialog provides controls for defining the look and feel of the schematic sheet, enabling and sizing grids, specifying the units of measurement to be used and any relevant document parameters. Use the dialog's 'What's This Help' feature to obtain detailed information about each of the options available. Click on the question mark button at the top right of the dialog and then click over a field or option to pop-up information specific to that field or option.