Specifically, this is to replicate a Zoom feature. where if you click on the Minimize button in the upper right of the call screen the entire call goes to a thumbnail view approximately 4 inches by 3 inches, shows the Active Speaker and has basic controls if you hover your mouse over it.
This allows working on whatever other platform you like, while having your video call stay on top in a thumbnail format just under the webcam perched on the top of your screen (or built-into the top of your laptop screen). It’s the next best thing to having Jitsi integrated into the platform you’re working on (perhaps better stated, it precludes the need to have Jitsi integrated in the platform you’re working on.)
(I spent some time unsuccessfully looking for this feature in the Jitsi call controls, and hopefully didn’t overlook an entry on this subject here in the forum when I scanned for one.)