I’m having problems with the Layout and Design portion of the Customizer. Specifically, the Site Max Width, the Site Width and the Content Width all appear to be inoperative. I’ve tried repeatedly changing the sliders from their minimums all the way to the maximums but doing so makes no difference in the appearance either in the Customizer or while viewing the page in a separate browser tab.
I noticed that when changing these sliders the Publish button remains disabled as though it doesn’t recognize that a change has been made. The Publish button only becomes enabled when I change from Fullwidth layout to Boxed or vice-versa. Still, making this layout change does not change the widths (except insofar as the sidebar appears or disappears).
I’m having this problem with Integrity, Renew & Icon (have not tried Ethos).
I’ve tried using both the default page template as well as the “Blank – Container | Header, Footer” template. Still have the problem; only time any width changes is when the sidebar appears or is removed.
No caching, Jetpack deactivated. WP, theme, plugins all up to date.
Initially, I had only a single page in this brand-new site so I added another page to see if that made a difference. Surprisingly, it did. The width controls started working once this additional page had been added. (But that new page is not the one shown in the Customizer. My Welcome page, the Front page, is still the one that was displayed.) Next, I tried sending that second page to the Trash. When I did that the width controls stopped working. So, I tried restoring that page. Now, even with both pages the sliders all fail to work.
Currently, the width controls are broken. How can I get these width controls working reliably?

