Good article thanks...shame the pro doesn’t have such an easy feature especially in these times...just means that this iteration was planned well in advance and couldn’t be changedIt is integrated into the power/sleep-wake button on Air 4 and works very well in any orientation in my experience. When you set it up, Apple also encourage you to register different fingers for landscape/portrait. So I have two index fingers registered on mine.
Check this out:
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iPad Air: How to set up and use Apple's new Touch ID fingerprint sensor
The new iPad Air is the first Apple device to have a fingerprint reader under the power button. We'll show you how to set it up.www.cnet.com