Is this the way it is supposed to be? Does not seem standard to me. This is an old question I never got around to ask about.

1. Use the dropdown filter in the outline heading
2. Type in something in "Filter for"
3. Now try to change what you entered. 
4. Single or double clicking the entry does nothing.
5. CTRL + A does nothing
6. Cannot highlight with my mouse
7. In short, I have to backspace to delete/modify the filter or click all

Is this by design? 

Thank you.

Jon