To change the thickness of barlines in a document

1. From the Document menu, choose Document Options, then select Barlines. The Barlines options appear.
2. Enter a new value in either the Heavy Line Thickness or the Thin Line Thickness text box. The units are whatever you’ve most recently selected using the Measurement Units command (Edit menu). (The default value for barline thickness is 0.46 points.) Note that this setting does not change custom barlines.
3. Click OK (or press ENTER).

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