Re :, the top panel is full of empty space and cannot be reconfigured. The above sets up settings for both western and unicode, so do make sure you set up for both 'Latin' and 'Other Writing Systems' and indeed any other language format you use eg: Cyrillic If you want more control over fonts then uncheck 'Allow messages to use other fonts'.set identical font sizes as the 'Latin'.Then select 'Font For:' and choose 'Other Writing Systems' (bottom of list).Set the 'minimum size' a bit smaller, so it stops people from forcing tiny font eg: 12px.Set all Font Size a bit larger than you are using for the Folder Pane & Thread Pane eg: 16px.The font specifically for the 'Message Pane' is controlled via:
So to set different controls for that area use: The Message Pane which displays email content also has additional controls because some people like that part to be a larger font size and many people like to control the minimum font size. This 'Font Size' effects everything - Folder PAne, Thread Pane, Message Pane, Menu's etc. Thunderbird Supernova is the first design which actually offers the user alot of user friendly control over font size (and spacing - aka Density) both via the 'Menu Bar' toolbar (View > Font Size) which you would need to enable BUT also via the 'Menu app icon' (3 lines) which actually states the Font Size being used and you use the + and - icons to increase/decrease font size.