Check here, for more details: https://www.c-sharpcorner.com/article/how-to-cancel-automatic-shutdown-in-windows-10/

There are several ways to do that

First way to cancel automatic shutdown in windows 10
Open Run by pressing window key + r
type shutdown -a and press ok button

Another way by using powershell /command prompt
Open Powershell or command prompt type shutdown -a. hit enter button