Windows 10 defaults to Automatic Updates and doesn't let you disable it in the normal method. If you want to stop Automatic Updates within Windows 10 - read on.
Windows Update is just another Windows process so it can be disabled with these simple steps:
1 - Open the Run command (Win button + R)
2 - Type services.msc and press enter
3 - Scroll down the services list until you see Windows Update
4 - Double click on it to open the Properties window
5 - Under Startup type click the down arrow and select Disabled
6 - Click OK and restart the computer
When YOU want to check for updates repeat the process, selecting Automatic and restart the computer.
You can then disable it when done.
I too prefer to have control of when updates are made on my computer.