Is this possible to have a multiselect Dropdown menu with the shortcode?
I have 12 list to choose from, checkbox is useful in that case but it doesn’t fit well in the design of the page. It would be better if the checkbox appears only after clicking on a button.
Ni, it’s not possible but you can try to use pure HTML mixed with the shortcodes. Probably it works just by adding a “select” with the name “nl” and for each option the value set to the number list and the option text as the list name (of course what matters is just the list number).