What does guidance say about any of the following:

1. Covering fire door vision panels with paper, posters, postcards etc.?

2. Covering fire door vision panels with privacy screening/film?

3. Using blinds over fire door vision panels for privacy.

The context would be in school buildings.

For fire safety they are only required where doors on escape routes sub-divide corridors, or where any doors are hung to swing both ways, others will have been likely fitted under Approved Document M for general accessibility.