By default Gravity forms isn’t accessible by editors. There are ways to do this with plugins like members.
As some might guess I prefer wp-cli for this:
wp cap add editor gravityforms_create_form gravityforms_edit_forms gravityforms_view_entries gravityforms_export_entries gravityforms_delete_entries graviyforms_delete_forms gravityforms_edit_entries gravityforms_view_entry_notes gravityforms_edit_entry_notes --grant
Running this will pretty much give all rights except the settings of Gravifty Forms.
It will allow creatign, editing & deleting forms. But also view entries and export them.
Full list of Gravity Forms Capabilities