how to stop an app from start when power on windows code example

Example: auto launch apps turn of windows

Select the Start button, then select Settings > Apps > Startup. 
Make sure any app you want to run at startup is turned On.
If you don't see the Startup option in Settings, right-click the Start button
Select Task Manager, then select the Startup tab.
(If you don't see the Startup tab, select More details.)