/SafeMode (devenv.exe)
Applies to: 
Visual Studio 
Visual Studio for Mac
Note
This article applies to Visual Studio 2017. If you're looking for the latest Visual Studio documentation, see Visual Studio documentation. We recommend upgrading to the latest version of Visual Studio. Download it here
Starts Visual Studio in safe mode, loading only the default environment and services.
Syntax
devenv /SafeMode
Remarks
This switch prevents all third-party VSPackages from loading when Visual Studio starts, allowing stable execution.
Example
The following example starts Visual Studio in safe mode.
devenv /safemode