By default, popups created with Nelio Popups are designed to resize responsively. If you need to disable a popup only on a mobile device to comply with Google’s Popup Policy for Mobile Devices, then you can do so quickly and easily.
Go to Nelio Popups » All Popups and edit the one you want. In the editor sidebar, go to the Settings panel, and open the Advanced tab. There, locate the checkbox ‘Show on mobile devices’ and deactivate it.

By default, the checkbox is checked. A popup will display on mobile devices unless that feature is turned ‘off’ (checkbox unchecked).