Only the multi-line text fields have OK/Cancel buttons. All you have to do is hit Enter after filling in the field.
This does seem to be a usability issue that keeps popping up.
+ Single-line inline editors without OK/Cancel are confusing for users
Just some more input. We actually are two or three people here having been confused by this. None of us thought of hitting enter to validate the change. (The effect being that it stays framed in red (unsaved) and when publishing you're warned for unsaved data, although i've seen it published anyway). All this looked like a bug. We let you guys consider if it's a valid usability issue or not. I tried the 'enter key' thing and indeed it works. Thanks.
Fixed on release-2.0.x (13d52e6). This will go into 2.0.6.
- PendingReview + Fixed