As long as the scrollbars of your WordPress site are disabled, only the content inside the sections will be visible. That's the reason why you can't scroll to the footer when using fullpage.js in WordPress.

So the solution is as simple as moving the footer inside a section. But do not worry, you do not have to do it manually  Our WordPress plugins for Elementor and Gutenberg already offer an option to do it: the "Show Theme Footer" option.

This option will try to move the specified site footer as an auto-height section (meaning not full-screen) at the very end of your page. Remember that the 'Theme Footer Selector' option should be given as a  valid JavaScript selector, for example .footerfooter#footer etc.

You might also find these articles relevant: