I looked at all the font options (I think) under Tools > Preference but
couldn't find an option for increasing the font size of the news item
titles. Did I miss it?
Hello. I'm new to RSSOwl and had the same problem. Here is what I learned:
You must restart RSSOwl in order to see the font changes.
"Feed Font" changes the font in the Feeds area (i.e, the window pane on the left side--default location).
"News List Font" changes the font of news titles (in the "tab" window pane). This is the one you are after, I think.