Django Oscar 4 requires us to configure a search engine. For this, we use Haystack.
Search engines allow us to index and search products efficiently, enabling things like ordering alphabetically, by price, or by date added etc.

Whoosh
 

Forcing products to be listed in the dashboard

mysite/templates/oscar/dashboard/catalogue/product_list.html

Remove lines:
67 {% if has_products %}
87 {% else %}
88 <p>{% trans "No products found." %}</p>   
89 {% endif %}
 

Automating index rebuild with Whoosh

Whoosh by default will require us to either run
python manage.py rebuild_index
or
python manage.py update_index

For a Store administrator this is not practical.
For this reason we can automate this process by detecting the post_save for Product.
Meaning that everytime the admnistritator creates or saves a new product we will update the whoosh index.

default_app_config = 'Store.apps.StoreConfig'

from django.apps import AppConfig

class StoreConfig(AppConfig):
    default_auto_field = 'django.db.models.BigAutoField'
    name = 'Store'
    def ready(self):
            import Store.signals

import threading
from django.db.models.signals import post_save
from django.dispatch import receiver
from oscar.apps.catalogue.models import Product
from haystack import connections

@receiver(post_save, sender=Product)
def update_index_on_save(sender, instance, **kwargs):
    def do_index():
        unified_index = connections['default'].get_unified_index()
        index = unified_index.get_index(Product)
        index.update_object(instance)

    threading.Timer(0.5, do_index).start()