[Tips]Use "Borderless window" display mode in MSFS
In "Full screen" mode, MSFS minimizes itself as soon as you switch to another program, and Windows hides the pop-outs along with it.
Flight Deck shows the pop-outs again in the background so streaming continues, but borderless window mode is the most reliable.
Where to set it: MSFS → Settings → Display → Display mode → Borderless window.