New features in this release
From Audacity Development Manual

This page is an overview of the key new functionality that has been introduced in Audacity 2.3.0
- Details of all the major changes since 2.2.2 can be found in Release Notes 2.3.0.
Contents
Coming up soon (Paul):
- Nyquist Effects now translatable.
- Spectrogram and Wave of same audio shown in the same track.
- It can already be done by scriptables, for mono, but is a hacky approach.
Not in 2.3.1
64-bit Mac build
The 2.3.1 release of Audacity for macOS is now a 64-bit build and will only run on modern 64-bit Macs.
Scrub Ruler
The Scrub Ruler is now turned off by default and is not displayed ...
Bug Fixes
There will be some ...
==Additional new features==
This page New features in this release - appendix gives an overview of further new functionality that has been introduced in this release of Audacity.
Links
> Audacity Release Notes 2.3.1 - detailed release notes for this release of Audacity