A link to the page in the manual that describes exactly how to input dynamics is shared earlier in this thread. The rest of the manual can be accessed from that page, too.
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The command Daniel describes doesn’t unconsolidated a single multi-bar rest, though I can see why you might think it does. The command instead enables or disables multi-bar rest consolidation for the whole layout, corresponding to the setting in the Bar Rests and Multi-bar Rests section of the Players page of Library > Layout Options:
