Can someone please let me know how I can stop my laptop

[2sugarsandapuppy]

Going into desktop or wallpaper or whatever it's called nanoseconds after I've stoped using the keys/mouse? That's it really - tia.

Control Panel. Display. Screen saver- that's for the screen saver.
Go to Power for power options

Hmm. Thanks for that. I only seem to have
Change colours
Customise background
Adjust screen resolution

under 'Appearance and Personalisation'. None of them seem to have those as sub-headings.

Right click on the desktop and select personalize. All your options for power/screen saver/etc should be there.

I am assuming this is a Windows machine? Not a Mac?

....if a Mac, click on the 'battery' icon in top right corner to open energy saving preferences.

All will be revealed.