Hi Cesium Team
I visit to showcase.
I click a building to show description and then click another building the panel hiding and no more see again.
Demo - https://youtu.be/CCOy1Mjnyms
macOS Monterey 12.0.1
Chrome 95.0.4638.69 (x86_64) 
FireFox 94.0.1
Safari 15.1 