If you want to set or edit a large number of existing Activity completion settings for resources and activities on your module, you can do this in bulk.
Editing in bulk works best when you select activities/resources with the same type of activity completion, e.g. all assignments or all resources.
In Moodle 3.9, this feature is called Course completion and is available from the Settings menu on the right of the page.
To apply the activity completion settings for a category of activities (e.g. assignments) which may or may not already exist on your module, you can use the Default activity completion setting.