NewMicrosoft Teams · Web
Microsoft Teams: Pop out calls into a new browser window
Teams browser app users gain the ability to pop out calls into a separate, persistent window, enabling continued call access while navigating away from or minimizing the Teams tab. This is an opt-in capability that enhances multitasking during calls.
Microsoft's description
Microsoft Teams browser app users will be able to pop out calls into a simplified call window that stays available while they navigate away from, hide, or minimize the tab or progressive web app (PWA) hosting the call. This helps users multitask and collaborate more easily during calls.