Use MacBook Air as a secondary screen
I want to use a MacBook Air as a secondary screen to my desktop iMac.
MacBook Air is 13", Early 2104 Model.
iMac is 21.5", Late 2013 Model.
I've connected the two using Apple Thunderbolt Cable. I've tried "Command f2" on the MacBook and there is no response. HOWEVER, the "Command f2" on the iMac worked and the iMac became the secondary screen to the MacBook.
Is there any way to enable the MacBook Air to be a secondary screen?
MacBook Air 13″, macOS 10.15