When you enable the local zoom feature, you can pinch your fingers together or apart on your touchscreen to zoom in and out in the remote desktop or application.
About this task
For Windows 8 and Windows 10 virtual machine desktops, and for Windows Server 2012 R2 and Windows Server 2016 RDS desktops and applications, you cannot pinch your fingers together and apart to zoom in and out unless you enable the local zoom feature.