This functionality was removed in Update 36 and SmartPlant Markup Plus Server 2019 SP 2.
Problem
One or more lines do not display when trying to view a DGN or 2D DWG file using View and Markup.
Common Cause
The Minimum line thickness setting must be adjusted.
Solution
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Open the file using View and Markup.
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Click More > Page display settings on the Brava! toolbar.
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Move the Minimum line thickness slider to the right to increase line thickness.
For more information, please see the Brava! Enterprise HTML Smart View Client User Online Help.