List Box Display as Dropdown possible?



I have very limited space on my form and I am confronted with the following problem:

- I have a very long list of items of which the user should select one, none or multiple. This eliminates the usage of a dropdown field.

- List Boxes would be better for this task, but they should display only the standard value "none" and expand like a dropdown list and then accept multiple values.

Is this possible, and if so: how? I spend the last 90 minutes googling and am still clueless, any help is appreciated.

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