Somehow all of my tasks are in a black and white small font, how do I change back?
 

So I clicked something by mistake and now all my individual tasks went from being in the default coloring, size and font - to small times new roman.

I think I did something with "paste style" function. How do I return to the normal font? Thanks!

If it's a style/layout thing you changed, you can edit those in preferences but it sounds more like you might have changed the project from parallel to sequential (or vice versa). When you open up that project, click on the arrows right near the task duration - they should either be parallel to each other or intersecting. See if that does it. Or it's possible you changed the parent folder from a single action item to a project? Is the icon the same?

Go to the OmniFocus Preferences. Click on the Style icon. Click the Reset button at the bottom left, which will take you back to factory settings.

Thanks! Worked perfect