Thank you @ruenel for your kind response.
When I did as you suggested, all the ‘products’ start appearing instead - which is not what I wanted.
Previously, the page ended at the bottom of the last image (a slider) in my 1st screenshot above. In other words, I had my own Categories and Products in the form of Slider Revolution modules. At the bottom of these modules was just the widget and footer. For some reason, the error messages appeared together with the ‘Categories’. Perhaps you can tell me:
a) Any clue why the error message suddenly appeared - Why is it I had to go to config.php to change “true” to “false”?
b) Is there a way to remove both the categories and products from the bottom of the page? I already have my own categories and products placed into Slider Revolution modules on the top part of the page.
c) I tried taking all my contents out of this page to a new page. Is there any implication if this new page is not the “shop” page as defined in Wordpress? Can it still function as a the Shop page for the customer?
d) If c is possible, then I will like this new page to have only the footer and widget, ie without the header and title. Am I correct then that either I put in CSS to remove the header/title, or enable “blank template”, and then put in CSS to insert the widget and footer?
Can you suggest which is better and what the CSS may look like?
Appreciate your patience.