Hello,

Please go through the Link

https://knowledge.autodesk.com/support/autocad-for-mac/learn-explore/caas/sfdcarticles/sfdcarticles/...

Last line in the link before the video:

Note: If these multi-touch gestures are not working correctly for you, make sure you have applied the most recent service pack for your product. Changes in the final version of OS X 10.10 (Yosemite) introduced a regression in some multi-touch gestures that were corrected in AutoCAD 2015 for Mac Update 1. The fixes are also included in AutoCAD 2015 for Mac Update 2.