Zoho web mail horizontal preview not scrolling

Zoho web mail horizontal preview not scrolling

Today when I opened Zoho web mail, I found that I can no longer scroll the email when using the horizontal preview mode; I can only see the first few lines of the email and can't scroll to see the rest.

This is happening on Chrome, Edge, and Brave browsers, and also when using the Zoho Mail App.

I rebooted my computer and made sure everything was up to date.  It was fine last night, so I'm guessing there was some change in the Zoho software overnight that made this happen - can you please look into it?