Customizing fonts and styles
In order to avoid too much fiddling around, OmniFocus doesn't support styling individual items. Instead, you can style all items of a particular type. For instance, if you select a single project row and make its font bigger, all projects in your OmniFocus database will also gain the new font size. You can independently change the appearance of the following types of items (listed with their default styles): Next actions — purple
Available actions — black
Unavailable actions — gray
Completed actions — gray with strikethrough
Single actions — blue
Projects and single-action lists — bold
On-hold or dropped projects — gray
Completed projects — gray with strikethrough
Groups — bold
If you want to get back to the default style for anything, just select it and choose Clear Style from the Format menu.
In notes, you can do as much rich-text styling as you want. To change the default style for all notes:
Style the text of an individual note to your liking.
Select the row that the note belongs to.
From the Format menu, choose Make Default Note Style. Any notes which didn't already have specific styles, and any new notes you create, get the style you chose.