I am using the Comcast e-mail app in a Windows 10 environment with Google Chrome browser. I want to change to a new standard font and font size, so I've gone to the 'gear' at the top right of the pane to change the settings. I enter my desired font (Arial) and font size (12 pt), then close the settings. But they keep reverting to a default font (Helvetica 12).
I had a 'chat' session with a Comcast tech support person yesterday, which was a total waste of time. First, he told me to go to the 'gear' window and make the changes I mentioned above, but I told him the changes would not 'stick', it kept reverting to the default font and font size in the e-mail app and would not accept my desired settings. Then he told me to go into my Google Chrome settings and re-set them to default......No Way! This changed all sorts of things, including my home page, my browser preference (Chrome, not Firefox) and my preferred search engine (Google, not Microsoft). After 40 minutes, I gave up.
There must be a way to set a new default font and font size that will show up any time I open a new 'Compose' window......if anyone has been able to do this, I would appreciate hearing from you.
This appears to be a new issue with the new email format. I've seen a couple of others in the forum with the same issue. But it's not just Chrome; I can't get it to work in Safari either. There was a Comcast OE in here who was going to look into it. So for the time being in the webmail UI you have to make any change in the Compose page on a per-message basis.
The best way to get around such quirks in the webmail is to enable the account in a desktop email client like Outlook or Thunderbird, or in another webmail account you might have that has a similar capability like Gmail, Outlook.com or Yahoo. Then you can use their UI to access your Comcast account.