In Cloud HCM are personalisations configuration or customisation?

Summary

In Cloud HCM are personalisations configuration or customisation?

Content

In Cloud HCM are personalisations configuration or customisation?

E.g. if we hide some icons in the custom Employee role or Line manager role e.g. hide stuff related to functionality that has we have not gone live with such as expenses , time, Skills and Experience etc.

Secondly, are these personalizations upgradeable when we get a new release of HCM cloud i.e. do they need to be reapplied following an upgrade ?