We'll create fresh WordPress site with Widgets Device Display Option installed. You have 20 minutes to test the plugin after that site we'll be deleted.
Takes ~10 seconds to install.
About Widgets Device Display Option
Adds option for widgets to hide or show depending on device type : mobile, desktop, or both.
Adds option for widgets to choose on which device they are displayed : mobile, desktop, or both.
The device detection is based on wp_is_mobile function.