Hi Terri,
The state of those selectors (checked/unchecked) depends on the corresponding options on the General Options -> Sources panel.
For example, for the Show search in content selector? is unchecked, if the Search in content? option is disabled by default: http://i.imgur.com/GaTrAvu.png
I know it does not make sense, and it’s very inconvenient, my apologies for that. Most of these selector options were already re-worked (categories, tags, custom fields), these are schedule for the next release.