In OmniFocus 2.8, basic search works the same way it has since 2014: Click into the Toolbar Search field or hit ⌥⌘F and type the string you’re looking for. The outline and sidebar are filtered to show just items in your current view that contain that string (if there are any). The part that’s new in 2.8 is that instead of being limited to just searching the current view, you can click the magnifying glass icon in the search field and expand the scope! The three search scope options (Here, Remaining, and Everything) mirror the search options available in OmniFocus on iOS.
Previously, I would have to create a new window that showed everything—I have a perspective for that—in order to do a global search. It turns out that I still prefer the perspective way because I can drive it from the keyboard. I can have a keyboard shortcut to open the perspective and then just close the window when I’m done. With the new global search, I have to use the mouse to change the search scope to global before the search and also to change it back afterwards.
See also: the full change list.
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