With this Plugin Item a long list of checkboxes can be displayed in a much more pleasent look.
Also, it has two optional buttons: One to toggle the state of all checkboxes, and another to reload the list, when it is changed in a different location. (E.g. when this item is part of a non-modal window, and the list is appended with another entry.)
Additional setting: Styling = User Theme Default (default)

Select "Berlin" & "Paris" with DASubmit with "Brussles" & "Oslo"

Setting: Styling = Hide Checkboxes and only Highlight Selected Values
If this setting is selected, you can pick a background color to highlight the  labels  of the selected checkboxes.