Component in separate window/layer

Sorry in advance for this one- sure it’s something simple. I have created a golf course in Sketchup. I wanted to add a rubber duck to it so have found one on the 3D warehouse. It shows itself in a different layer. I dont know how I got to this layer (and frankly- I just want to forget the duck idea). Problem is- I dont know how to get back to my golf course. What am I doing wrong?

Thankyou so much for any help. I really hope I dont have to start again!

backup the file, just in case…perhaps upload the file so we can edit

however try delete the duck, check that layer0 is current. Then via the window menu, model info, press the purge all.— this will clear all unused layers, components…

zoom all,