If you read the Polaris star Wikipedia article, it states that Polaris is a multiple star system, but when I fly to Polaris in Space Engine, there is only one star.
The catalog of multiple stars is not finished.
Also, sometimes I can't find objects with Search (I suspect this could be because it's just a beta software and everything is not added yet). For example, I can't find the Cat's Eye Nebula (NGC 6543) in the Search window.
All nebulas are not included in SE. Making nebula models is a long-term work, and thet are added little by little.