How @Naveenadevi S
Popular Topics works by essentially capturing the view count for topics each day (there is a scheduled job) and the widget get's populated based on the most visited topics, the most popular.
It might be worth reviewing the 'Recommended for you widget'. This widget is more advanced and has the capability to surface content to a user based on their role, location etc. It is part of Employee Center Pro I believe, and for best functionality requires Employee Profile to be enabled.
If you are not on Employee Center Pro, or you are just set on using the popular topics widget in this way, you would need to do extensive customisation.
It's worth understanding what specifically you are wanting to achieve here. It could be the case you could use other OOTB widgets to achieve your goal. For example showcasing specific items to managers only, or creating a widget that shows specific managerial based content
