Hi there,
This information is available in outsystems metamodel, you can query that and then can do what serves you best (screen, extract an excel, etc.).
For that, you can use entities from System: Entity (for entities and all its metadata) and Entity_Attr (for attributes of an Entity):

Just don't forget to filter both entities with Is_Active = True, because entities and attributes that you have deleted will be there with IsActive = False.
Cheers,
João