How to specify which form mode to use for a content type I created a new_form_mode for a content type in D8 and removed some fields in that form mode from Manage form display tab of the content type by selecting that new_form_mode . But how can i select that form should be displayed for that content type instead of default form mode?
Unlike view modes you can't select form modes out of the box. To manage form modes you need a module. You can try one of these:

https://www.drupal.org/project/form_mode_control

https://www.drupal.org/project/form_mode_manager