Hi,
The Site is running well in Mobile View but some component are affects by the external plugins.
Yes your default page layout is set to ‘no sidebar’ option. You can change the layout option to ‘right sidebar’ or ‘left sidebar’ so that you can use different widgets on sidebar even the image widget.
To change the layout option, Please go to “Appearance > Customize > Layout Options > Content Layout”.
after set to right or left sidebar option then you can set widgets from widget option from customizer.
Thanks