What is the "Showcase" on the profile? Can I use the items displayed on it?

To access the "Showcase," go to the "Me" tab, tap on your profile picture, click "Preview" at the bottom, then select "Honor," and finally tap on "Showcase."   The "Showcase" feature is for display purposes only, showcasing items you have previously owned or are currently using in live or voice rooms, including: Mic Effects, Comment Bubbles, and Backgrounds. The items displayed here cannot be directly used by clicking. If you have available items, join any voice room, tap on the "Shopping Center" icon at the bottom, tap on "Owned" in the top right corner, and click the item to start using it.