Selecting Measurement Units
You can select separate measurement units for LibreOffice Writer, LibreOffice Writer/Web, LibreOffice Calc, LibreOffice Impress and LibreOffice Draw documents.
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Open a document of the type for which you want to change the measurement units.
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Choose LibreOffice - PreferencesTools - Options.
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In the left pane of the dialog, double-click the application for which you want to select the measurement unit.
Double-click LibreOffice Writer if you want to select the measurement units for text documents.
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Click on General.
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On the General tab page, select the measurement unit. Close the dialog with OK.
Entering measurement units directly
LibreOffice - PreferencesTools - Options - LibreOffice Writer - General