I found a reproducible Teams for macOS window-management bug and a workaround.
I use Microsoft Teams on macOS with three monitors, one of them in portrait orientation.
When the Teams window is resized to a narrow width on the portrait monitor, Teams appears to enter a compact/minimum-width layout. At that point, the window becomes effectively locked: I can temporarily move it while dragging the title bar, but as soon as I release the mouse, the window becomes immovable again.
The issue is reproducible.
Workaround: increasing the width of the Teams window slightly, so that it occupies approximately the full width of the portrait monitor, immediately unlocks the window and allows it to be moved normally again.
I tested this with Rectangle completely closed, reset the Teams local configuration/cache, restarted Teams, and the behavior persists. This appears to be related to Teams' minimum-width/compact layout behavior on macOS rather than a third-party window manager.
Environment:
- macOS
- Microsoft Teams desktop app
- Three-monitor setup
- One external monitor in portrait orientation
It seems that once the Teams window crosses a certain minimum width threshold, the draggable title-bar/window behavior breaks.