How do I set to Shuffle images in iscreensaver

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How do I set to Shuffle images in iScreenSaver 6.8.6

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Welcome to the forums!
In iScreensaver, you operate on a Sequence which contains 1 or more Sequence Items. Each Item can be an image, video, or 3D model (GLB) file.

To change the playback order, you set the global Sequence settings which are on the Settings window on the Global tab, as shown here: