Is it possible to display the screensavers on both monitors when dual monitor is configured?

If you configured the dual monitor as “For Duplicate your displays”, the screensaver can be displayed on both monitors; however, if you choose the “Extended your displays” option, this will not work.

You can change the display settings of your monitor by following the steps:

1. Click Start  and go to "Control Panel - Appearance and Personalization – Display- Change Display Settings".

2. Select the Duplicate these displays option in the Multiple displays drop box.

Then, choose the screensaver and it will be displayed on both monitors.

More information:

Work and play better with multiple monitors