How do I make steam windowed big picture mode?

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Tags

1. #steam
2. #shortcut
3. #quotation
4. #press
5. #simply
6. #picture
7. #button
8. #enter
9. #course
10. #marks
11. #start
12. #controller
13. #without
14. #active
15. #restart
16. #windowed
17. #while
18. #window