saguaros
I have entered the login details.
There are two modules with the value " d-none d-md-block" in Module Class, without quotes and with a space at the front of the string.
One is a banner module in "sidebar-r" that displays blue boxes on all pages.
With this module the string works; on a smartphone the blue boxes do not appear, but just orient the smartphone horizontally the boxes appear again.
Even with the Dev Tools in Chrome I see the string.
So the string is correct.
Then there is a Custom Module in "header-r".
This instead always appears on all devices and with the Dev Tools I can't see the string.
There is probably some conflict that I can't find though.