NewMicrosoft Teams
Microsoft Teams: Pop out calls into a new browser window
Teams browser app users can now pop out calls into a separate browser window, enabling multitasking without losing call connectivity when navigating away from the Teams tab. This is an opt-in feature with no administrative action required.
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.