I would like to ask, percentage of what? It’s not clear to me, and not detailed in the manual (perhaps it’s too obvious, and this blockhead can’t see it).
According to the Version History:
Fermatas, caesuras, and breath marks all now influence playback. Playback of holds and pauses works by automatically manipulating the tempo during playback to achieve the required prolongation of the held note, and likewise manipulates the played lengths of the affected notes to allow a gap, if required, before the normal tempo resumes.
For fermatas, options to control the default amount by which the written duration should be extended and the length of the gap for each type of fermata from short to very long are found on the Timing page of Playback Options, and these can also be overridden on a per-fermata basis via the new Hold duration and Gap duration properties in the Holds and Pauses group in the Properties panel.
A new Hold only property has also been added for fermatas, making it easier to specify that a fermata should only extend the duration of notes, and not create a silence before the next note.
Ah. Didn’t think of looking in the Version History. Good advice. [I thought it may refer to percentage of the current tempo.]
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@Lillie_Harris it may be good to put that explanation in the manual.
May I refer you to the page entitled “Holds and pauses in playback”.
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Ja, but it does not say parentage of what. As mentioned above, it is not immediately obvious it is the note value (when you are a blockhead like me).
And what if you have a fermata on a barline? Then what it is a percentage of?
I believe a fermata is “morally” attached to a note and then graphically moved by Dorico to be above a barline. So, it would be a percentage of the duration of the note it originally was attached to.
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So does that make all of my fermata-less music “immoral,” @MicheleGalvagno …? 
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@MicheleGalvagno I thought as much myself. Yes, the note or rest preceding the barline. Again, to be a pain, possibly worth mentioning in the manual.
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Saying this again in the same thread on the same day won’t impact my authoring decisions, by the way.
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@Lillie_Harris I am not repeating myself. It’s a new and additional point - to what does a fermata on a barline refer to in terms of percentage. Please read my posts more carefully.