Hi, Tom.
How can I pull out “CUSTOMIZE” on a single selected page? Before I could find this option in the top admin bar in the front end of any page of my website.
Now, when I click “CUSTOMIZE”, the first thing I see is my main page.
The options in the customizer are global options for all pages. You can still navigate to the page you want to edit when the customizer is activated.
For all page specific options you would need to use the metaboxes on the Edit Page screen on that page.
If you are having trouble customizing something can you provide a link to your site and specify the element? I can point you to the right direction better that way.