This article explains how to disable zoom in Internet Explorer

Please see the procedure below to disable zooming in Internet Explorer.

Sometimes you may inadvertently 'zooming in' when using the pinch/zoom gesture while using their unattended kiosk. How do you disable this?

The below .reg entries will disable IE's zoom ability, thus locking it at 100%. Pinch/zoom and all other gestures are not changed. 

All Users
Windows Registry Editor Version 5.00
[HKEY_CURRENT_USER\Software\Policies\Microsoft\Internet Explorer\ZOOM]
"ZoomDisabled"=dword:00000001

Specific Users
Windows Registry Editor Version 5.00
[HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\ZOOM]
"ZoomDisabled"=dword:00000001