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Did you create new physics groups. If not creating, physics window grayed out. Check below, please. https://docs.live2d.com/en/cubism-editor-manual/physical-operation-setting/#:~:text=for%20Physics%2… (View Post)
Maybe your 'track length' is shorter than 'work area'. This is the manual. Please try making sure the track length is the same as the work area. https://docs.live2d.com/en/cubism-editor-manual/timeli… (View Post)