: If it isn't working, check your device settings under Apps > Special app access > Picture-in-picture (Android) or Settings > General > Picture in Picture (iOS) to ensure the feature is enabled. How To Turn On Miniplayer On YouTube - Step By Step
For mobile devices, this feature often works as part of "Picture-in-Picture" (PiP) mode: MSDMiniplayer
: Hover over the mini window to access pause, play, and skip controls. : If it isn't working, check your device
: Touch and drag the player to move it anywhere on your screen. You can often pinch-to-zoom or double-tap the window to change its size. : If it isn't working