Select > Subject was introduced in Elements 2020; this new feature is powered by Adobe Sensei. You just click once and Elements automatically selects the main subject in your image. If Elements is not intelligent enough, you can edit your selection -- Add to selection or Subtract from selection. You can also invoke Select > Refine Edge.
Back in Elements 11, Adobe introduced an updated Refine Edge (brought over from Photoshop).
Refine Edge in earlier versions will have a different interface, fewer choices of adjustments, fewer View Modes, and limited output (how your selection is sent back to the Editor).