When there is a mixed response to the question, the result is undefined - hence the 9s

This is indicating that some of the bookmark range is hidden and some of it isn't. Generally this is visible in the dialogs like the Font one you showed as a three-state checkbox
- Empty box says this is false
- Ticked box says this is true
- Black filled box says parts are true and parts are false

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Andrew Lockton
Chrysalis Design, Melbourne Australia