@Mourya, Aditya Thank you for reaching out to us, As I understand end user in your organization is unable to find Show Bar option in Sensitivity button (within office apps),
Refer to this article: https://learn.microsoft.com/en-us/azure/information-protection/rms-client/clientv2-admin-guide-customizations#display-the-information-protection-bar-in-office-apps it has the steps related to Show Bar.
Let me know if this doesnt help, we can connect offline and to discuss further on the same.