Many selects

The Many Selects module enhances the administration experience on work with select field types when a multiple selection is required. This provides a better Widget for select field type that allows a content manager to have an easier and faster way to add desired options for the list field. Drupal 8 Actively maintained version of Drupal 7 Multiple selects module.

INSTALLATION

Install as you would normally install a contributed Drupal module. Visit:
https://www.drupal.org/docs/8/extending-drupal-8/installing-drupal-8-modules
for further information.

HOW TO USE

Go to Entity Form Display and select "Many select list(s)", configure it.

MODULE CONFIGURATION

No configs required.