Other questions like this are similar but don't address the problem of how to select a particular mesh if there are many meshes in a model.
For instance, this model (https://poly.google.com/view/6mRHqTCZHxw) contains many meshes.
One way to find the mesh corresponding to the helmet is to manually select each mesh in the Outliner editor (top of right-hand bar) until the helmet gets highlighted. This is tedious.
Is there a way to click on the helmet and identify the corresponding mesh?