To enable the 'none of the above' option or include a 'something else applies' option in multiple select nodes and make them exclusive, you can use conditionality within a Multi-Input node. Here's a step-by-step guide:
Step-by-step guide
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Create a Multi-Input node with the following components:
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An optional Multiple Select sub-input for your valid options.
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A non-optional Multiple Select with only one option, such as None of the above.
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In the upper content field of the Multi-Input node, add your question or call-to-action. Leave the sub-input content fields empty to avoid unnecessary line breaks.
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In the first input field (the optional Multiple Select sub-input), provide all non-inclusive options. Set this node to optional (even though it is not optional) to enable navigation when the user selects None of the above.
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In the second sub-input (another Multiple Select sub-input), provide None of the above or a similarly worded option as the only choice. Leave the content field empty.
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Toggle Show conditionally on and set the condition to ALL, ensuring that it accounts for all other options in the upper sub-input to be not contained (does not contain ⊅).
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Create two or more transitions out of this Multi-Input node:
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One transition where None of the above contains None of the above.
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Additional transitions based on the selections made in the upper sub-input (containing all other options).
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You will be left with a multiple select that will only show None of the above if no options were selected, and requires an answer to proceed.