How do I access the PAGE code editor?

Can someone tell me how I access the PAGE code editor? Finding the backend and public page editors are obvious, but I am unable to determine how to open the PAGE code editor.

See the article Wix Code: Working in the Code Panel

Thank you. Nothing obvious appeared there initially, and I had no idea it was accessible until I hovered my mouse pointer over the “[PAGE NAME] Page Code” bar at the bottom of the page and discovered that by clicking it or clicking and dragging its top border upwards that it was even there. Wish it were a little easier to find.