The following is an overview of the changes made to AutoCAD Mechanical 2020 toolset.
As part of our continuous efforts to provide a great visual experience to our customers, the AutoCAD Mechanical 2020 toolset release has new 'flat designed' icons in the user interface for command window and toolbars.
AutoCAD Mechanical user interfaces are now optimized to work with high resolution monitors. As a result, dialog boxes such as the Content Manager, Screw Templates, Parts List, and Options dialog boxes, scale correctly when you increase the text size in Windows display properties.
Your user interface is obviously something that you use all the time. Past customer feedback repeatedly indicated that we needed to make significant changes to improve the clarity and crispness of the dark theme. Similar sharpening was also applied to the light theme as well.
As you can see, we optimized the background colors with the icon colors to provide the optimum contrast without distracting from the drawing area, where you're usually focused.

Autodesk Viewer now displays all the properties of AutoCAD Mechanical toolset objects such as Symbols and Standard Content.
AMDIMARRANGE is enhanced to support arrangement of multiple vertical and horizontal dimensions.
Standard content in block definition can now show up in Insert ribbon gallery.