You can play texts in a playlist in random order each time. If you want a fixed order, use the same steps to turn it off.

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Tap the playlist name at the top of the list screen (for example, "Voicepaper"). Open this menu first to toggle random playback on or off.

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Tap "Play in Random Order" in the menu to toggle it. When enabled, a checkmark appears on the right.

If you want playback in order, tap "Play in Random Order" again to turn it off.