I noticed that you have asked the same question in this forum thread
. You can find our answer there.
We would kindly ask you to use just one support channel to contact us. Posting the same questions more than once slows down our response time because we will need to review and address two or more tickets instead of one. Moreover, this thread concerns the localization of the QuickNavigator rather than its size, so it you have a question that is not related to the main topic of a thread, we would kindly ask you to directly open a new thread. This will allow our community to revise the threads more easily and to find the information they are looking for.
the Telerik team