To do Alt + J + P + K on Mac in PowerPoint, download and install Accelerator Keys, then press Option, followed by J, P, K.
Command: Quick Styles
This is how to do Alt + J + P + K on Mac in PowerPoint with Accelerator Keys, the native ribbon and alt key shortcut solution for Mac users who get more done with PowerPoint.
Alt + J + P + K opens the Quick Styles gallery in PowerPoint. This provides pre-designed picture styles that combine borders, shadows, and effects to quickly format your pictures with a professional appearance.