How to check Bounce Leads for a certain campaign?

In your campaign Report section, you will find a metric that says Bounced. It shows the number of Bounced Leads in your campaign. It is clickable, and by clicking this, you will be able to view the detailed bounced lead information including bounce type and subtype.

List of Hard Bounced (permanent bounced) leads and Soft Bounced (transient bounced) leads can be seen after clicking Bounced

More Detailed information can be found if any bounced lead is clicked in the Activity tab. Here you can check whether the Lead is Transient Bounced (Soft Bounced)

Or, the Lead is Permanent Bounced (Hard Bounced)