I've tried remapping the Cmd key from the default 'Windows' key to the Ctrl key, making it easier to switch between Mac and Windows. However, whether I do this remapping using the Parallels Shortcuts menu or something like SharpKeys on the Windows side, pressing Cmd will randomly zoom in/out in Visual Studio. I've tried reinstalling Parallels tools and turning 'Send OS X system shortcuts' to Auto, Always, and Never, and I've turned off all keyboard shortcuts to zoom in/out in Visual Studio. Any idea why this keeps happening? (Sorry for reposting, but no one seems to be responding to the old thread.) Mac OS X 10.11.6 / Windows 10 / Parallels 11.2.1 / Visual Studio 2015 Community Edition
I came across this post in Stackoverflow which is about disabling the CTRL+Mouse scroll to zoom in/out. Please check if this is something that could help you.