One way to find 'Used Styles' is:

Go to 'Styles and Formatting' (F11), and choose 'Applied styles'

This will sow all styles that are used 'somewhere' in the document.

It is not possible to find the location where they are used, which would be a nice enhancement too.....

Hi Hans,

(In reply to comment #0)
> Numerous styles are showing in the style list.  It would be nice if there
> would be a way to identify those who are not used in the document, ...

The dropdown list Apply styles shows some always by default, and for the rest only those in use. And indeed, also see the answer for Luuk.

IMO a WORKSFORME, OK?
Cheers,
Cor

(In reply to comment #1)

> It is not possible to find the location where they are used, which would be
> a nice enhancement too.....


Ctrl+H > Options .. find styles (only paragraph styles, that's true - rfe to include character styles does exist.)

Yes, we have "Applied Styles".  We are missing "Unused styles".  It would be practical to have this to cleanup the list.

REOPENED is reserved for a bug that:

1. a developer has marked as FIXED;
2. a developer is assigned to the bug that is marked as FIXED;

In this case the enhancement request was never independently confirmed so correct status is UNCONFIRMED. Thanks!

(In reply to Hans Deragon from comment #4)
> Yes, we have "Applied Styles".  We are missing "Unused styles".  It would be
> practical to have this to cleanup the list.

Seems like a reasonable idea for improvement. I don't see any current interface that provides this information.

Status -> NEW

Handing this one over to the UX folks for input on the interface.

(In reply to Hans Deragon from comment #4)
> Yes, we have "Applied Styles".  We are missing "Unused styles".  It would be
> practical to have this to cleanup the list.

I agree. 
For the implementation it would then be wise if the styles that are not used, but that other styles that are used inherit from, are excluded somehow? Or that on deletion the inheritance is broken.