How to have a empty / not pre-loaded by default field with the first option when creating a post from with taxonomies. The needed output is to have front-end form that with have all options at drop down menus starting with "--Choose from the list--".
Unfortunately, this currently isn't an available option, though we do have quite a few requests for it and internally this has been added to a development board to be worked on "soon", though I can't be any more specific that that.
In the meantime, you need to add a little JS to the form to insert empty options into the taxonomy selectors.
Examining the markup on the front end, taxonomy select dropdowns have name attributes such as "status[]" or "priority[]", i.e. they always end with square brackets, so we can use that to automatically select any number of taxonomy selectors in the form and add an initial empty option like so: