is a "Hardware Unlock" device for newer versions of rekordbox. To use Performance Mode, you must have a paid subscription (such as the Core or Creative plan).
If the DDJ-SB2 icon is greyed out, click it and select , then unplug and replug the controller to force macOS to re-recognize it. Common Issues with DDJ-SB2 on Mac ddj-sb2 rekordbox driver mac