second screen
Hi, Ive an Imac 4k 21.5" Late 2015 & an iPad Pro 9.7". How can I use iPad as a 2nd screen?
iMac Line (2012 and Later)
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Use your iPad as a second display for your Mac with Sidecar - Apple Support
If you don't meet the requirements you would need a third-party app such as Duet.