Zoho loads a responsive CSS rule that sets the generic .mobile-view class to display: none in portrait-sized viewports. Discourse also applies mobile-view to its root <html> element, so the Zoho rule unintentionally hides the entire document. Rotating the device to landscape moves the viewport outside the applicable breakpoint, and the site becomes visible again.
The Zoho CSS should be limited to that widget only with:
.zsiq-container .mobile-view {
display: none;
}
instead of the one used now
.mobile-view {
display: none;
}
However I’ve overridden the rule on the theme component you’re using with
html.mobile-view {
display: block !important;
}
and all is working as it should.