Since 63.1 was a hotfix, it carries over the major improvements introduced just days prior in version 63.0:
: Sketch 63.1 was part of the final series of updates to support macOS 10.13. Starting with version 64, the minimum requirement shifted to macOS 10.14 (Mojave). Summary of the Parent 63.0 Release Sketch 63.1
: Made selection behavior more consistent, specifically when Shift-dragging over points. Since 63
: Significant performance boosts for sharing complex documents with teams. For the most up-to-date features and security, you
: Resolved an issue that blocked the saving or updating of Cloud documents when working in a shared team environment.
: This version requires macOS High Sierra (10.13.4) or newer.
For the most up-to-date features and security, you can find the latest builds on the Sketch Releases page or view more details in the official changelog . 63.1 - Sketch