I have Microsoft Windows 10. I have a program called Gallery. How do I stop the "slideshow"

[AC Question]

I have Microsoft Windows 10. I have a program called Gallery. How do I stop the "slideshow"

I have Microsoft Windows 10. I have a program called Gallery. How do I stop the "slideshow" that comes on when computer is idle for more than 10 seconds? Also how do I create a "slideshow" form the photos from the Gallery with just the photos" I want?
I use Chrome.
Thanks,