For that, switch from the Overview to the Plugin Secrets.
Create a new secret via the plus and enter a name and description (optional)
…and then generate the secret.
Afterward, you can download the generated secret.
Plugin Secrets Overview
After you have created a Secret, it appears in the Plugin Secrets Overview.
All existing entries are displayed.
On the right side, you can delete it or generate a new secret if necessary.
Besides that, the Total Registrations and Registrations per Plugin are displayed on the right.