General Drawing Enhancements (What's New in 2021)
A new command, Centerlines, is added and the Measure command is now supported in drawings.
New Automated Centerlines Command
Use the new ribbon command, 
Annotate tab Symbols ribbon panel *Centerlines * to specify centerline behavior for the selected view. Default centerline behavior is defined from the Drawing tab in the Document Options dialog box. To change the behavior for an individual view, select a view and configure the settings.
For more information on centerlines, see Automated Centerlines Reference.
Measure Command Now Supported in Drawing Files
The Measure command is now available in Drawing Files
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For more information on working with the Measure command, see To Measure Distance, Length, Angle, Loop, or Area in Model.