How to set background as slideshow on my PC?

Follow https://support.microsoft.com/en-US/Windows/Experience/Personalization/change-the-desktop-background-in-windows#change-your-background

• Slideshow: Select a folder of images to cycle through as your desktop background. You can set the interval for how often the images change, and if you want to shuffle the pictures. Additionally, you can right-click on the desktop and select Next desktop background to move to the next picture.

If you use multiple desktops, here are some tips and things to be aware of:

• You can select a different background picture for each desktop. To do so, right-click on the image preview under Recent images, then select Set for all desktops or select a specific desktop to apply the background to.
• Configuring a background picture per monitor isn't supported.
• Slideshow as a background isn't supported.

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hth

Marcin