You can download a coy of the owner manual here:
Download A PDF Copy of Your Splendide Combo Washer-Dryer Owners Manual
The Splendide does not much like to have you tamper with the controls - it really likes to start a cycle and manage on its own to the end. The knob will spin round & round if it has not yet completed the previous cycle, so you need to get to a normal end before you can set for Dry only. Merely turning it OFF does not end the previously programmed cycle, so it needs to be RESET before you can enter a new one, e.g. Dry Only.
You should be able to set the big dial to RESET to end the current cycle. Then set the big knob to one of the DRY positions and put the Dry Time on the other knob and press On. That should do it.
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Gary Brinck
2004 American Tradition; 2007 GMC Acadia
Homebase in the Ocala Nat'l Forest near Ocala, FL