Panels can be seen across the V3 interface. A panel provides contextual and detailed information based on an click or hover interaction of data by a user. Panels are seen inside of the content editng experience expanding the users capabilities.
These images display the Panels being used in the Content Section in the DXM experience.
These images display the visual references for how the panels should look and be used in the DXM experience.
IMPORTANT - Full overview of the Panels use cases can be seen > here.
Below are functional UI elements for how the tabs should look and feel while being used in the DXM experience.