Add a border to a sheet
Turn on Add Border and set its thickness and colour under the sheet's Sheet Margin settings.
The border controls appear under the sheet's Sheet Margin settings.
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'Visualize Margins' is above the 'Add Border' checkbox.
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Enabling Add Border reveals the Thickness (mm) and Color fields.
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The border thickness is entered as a number in millimetres.
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In the Sheet Settings panel, turning on Add Border reveals a Color picker for the border colour, alongside the Thickness (mm) field.