Unable to see the numbers of pages in the bookmark panel when hovered in InDesign.

I have a problem with linking my pages. 

i used to see the numbers of pages in bookmark panel when i hovered over the bookmark. No i am not able to see the pages number which makes the linking very complicated and difficult. how do i change this setting so i can see the pages numbers again. 

i haven't done anytning. the setting changed itself and now i don't know how to go back. i tried closing and opening the document. didn't work. can somone help please

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