How to remove "What's new in Photos" Page

I've been using Photos and its predecessor iPhoto for years. The unwanted screen appeared a couple of weeks ago when I had to regenerate the photo library from Time Machine because of a corruption problem.

What is most interesting is that not more than 10 minutes ago when I started Photos, as a test, the undesired window disappeared. I have no idea why. It still hasn't shown up despite my quitting and restarting Photos.

I appreciate your interest in trying to help me. Thank you.

Perhaps my system has some 'self-healing' properties.

I've attached a screen shot of the page. There is no checkbox that I can find.

I assume you mean the "Get Started" button. When that is hit the window disappears and the usual Photos screen is visible. The "What's New..." window is not a problem, just an annoyance.

Thank you. I've made a point to check that periodically.