Turn automatic updates off?

Plankton said:

It's not an option anymore.

No, MS don't want you to have a patchwork of hotfixes with security gaps for ones you didn't fancy (as was possible in Win7). You do have some control in Pro though, you can postpone the inevitable. See this tutorial.

Windows Update - Defer Feature and Quality Updates in Windows 10

For other options available to you, see this tutorial and the long list of related tutorials at the end of the first post. There are Group Polices in Pro that should suit your needs, those related tutorials show you how to use them.

Check for and Install Windows Update in Windows 10