On the popped out separate friends list I can either press on the box with the arrow going into it or on the x in the top right corner. Both return it back to the launcher.
If I have minimised it using the - then it appears on my task bar
htt ps://cdn.discordapp.com/attachments/1239113623134142578/1261688765664067676/image.png?ex=6693deba&is=66928d3a&hm=0e89a803ca87cb2bc34969e5f95d9f05d8492406c2b6ab3d2eefb8661fc08de5& where exactly?