One of the biggest changes that macOS Monterey 12.3 brings to Mac users is the addition of Universal Control. This new feature was announced at WWDC 2021 in June. It was also expected to be available as a part of the original macOS Monterey in October, though Apple delayed the feature.
Universal Control requires your iPad to run on iPadOS 15.4, and both your iPad and Mac to use a single Apple ID. The devices should also be within a few meters of each other.
Once all the above conditions are fulfilled, you can leverage Universal Control to use a single mouse and keyboard across your iPad and Mac. You can also drag and drop files between the devices using the new feature. In addition to Universal Control, Apple has included spatial audio support in macOS 12.3 specifically for Mac devices with the M1 chip to allow users with supported AirPods to experience a surround sound experience.
Apple has introduced iPadOS 15.4 with features including Universal Control, over 40 emoji, and the updated Siri that includes the new voice. Siri on iPadOS 15.4 can also provide time and date information while offline on iPad Pro and later models. Further, the new iPadOS version includes an updated FaceTime that enables SharePlay sessions initiated directly from supported apps.
The iPadOS 15.4 update also includes the ability to adjust volume controls when you rotate your iPad. The update additionally carries bug fixes to address issues including one where the keyboard may insert a period between typed numbers.