2.3.3 is an important stability release for a number of different features: changes to source control to resolve Github authentication issues; support for using Android NDK 22, Android Studio 4.2, and the latest Xcode on Big Sur; optimisations for the amount of work done by the IDE when displaying your projects, reducing CPU usage; and a number of performance fixes in-game also.
At the same time, it does introduce several new features, including: the Inspector has been greatly extended to support multiple additional editors; a big change to how undo/redo worked within the IDE, giving you more flexibility and a better experience; you can now declare default values for your functions' optional arguments; and in-game you can now support two mouse thumb buttons on Desktop platforms.
There are of course also a number of important bug fixes, so please do read the full release notes carefully:
Also see
our Required SDKs helpdesk guide as this release does add support for some newer external tools on various platforms, so please ensure you're still using supported SDKs.