trying to follow instructions on adding a second monitor to my MacBook Pro (15-inch, late 2013) but there is no Arrangements option on Display section???
I have HDMI from MacBook Pro to adapter, adapter to MacBook Air. I want to use MB Air as second monitor. However, when I go to System Preferences, Display there is no option for Arrangements to set up. Can someone help?
MacBook Pro 15″, macOS 10.15