SProbot highlights sites which contain subsites, enabling you to determine a way forward to move content into a more modern structure if necessary.
Why should this be reviewed?
Microsoft does not recommend using subsites in its modern information architecture documentation. Subsites are mostly bad because they result in overly complex navigation at different levels, and can also cause access confusion with overcomplicated permission configuration. If you're still using subsites, it's recommended that you consider moving content into a modern flat structure using hubs instead.
Subsites do not cause any immediate critical issues, but it is good to be aware of their existence for planning purposes.
How do you see sites which contain subsites?
In Reports > Reviews, choose the Sites with subsites review.
More guides
Use the sites with large files review to identify sites and teams which contain large files which can be cleaned up to increase available storage
Use the sites with inactive files review to identify sites and teams which have a large percentage of inactive files
Use the Reviews tools to proactively identify and resolve issues which may affect storage and security on your tenant
