Multiple region selection

I would like to be able to select multiple predefined region on the submit form like we can do in Admin. It’s possible to toggle multiple select for job category, why not for predefinied region?

Also, the form still ask for a job’s city even if there’s a preselected list. Anyway, this string will not be displayed. Can you turn it off when this plugin is activated?

Thanks!

https://www.ads-software.com/plugins/wp-job-manager-locations/