While 2021.7 was primarily a maintenance release, it stabilized features introduced in 2021.6, such as:
To run Pro Tools 2021.7 on a Windows PC, your system should meet these specifications: Avid Pro Tools V2021.7.0 Win Retail-r2r High Quality
Improved dark theme stability and customizable GUI elements for a more personalized workflow. System Requirements for Windows While 2021
Native systems gained support for up to 128 audio tracks , 512 instrument tracks, and 512 MIDI tracks. it stabilized features introduced in 2021.6