I get no help from belong to this forum. NO ANSWERS.
Besides this post you posted here: http://www.roundcubeforum.net/10-miscellaneous/30-forum-feedback/9127-how-do-i-change-font-view-formattingin-my-e-mails.html
So, be patient and just wait ... This is a user to user support forum an no official helpdesk.
I'll also point out that it helps if you post your question in an appropriate forum. Your question went into the general forum feedback area instead of the general support or release specific thread. I'll move it.
On my Android using Tapatalk app