Hello Gregory,
Thank you for posting your concern with regards to your Surface Pro that zooms in when you touch the screen. We understand that the issue started after you installed the April 10 update. We would need to know the current OS Build version installed in your Surface
and to find out what it is, click Start and type winver
in Cortana. Once you found out which OS build is currently in the device, you may
download the latest drivers and firmware for Surface Pro 3.
Let us know if you need further assistance.
Thank you.