Can Overlay Panels trigger another panel when closed?

Hi,

There isn’t a built-in for this. It will require custom JavaScript.

Try follow the steps below:

1. Add this JS to a hook element, set the location to where the overlay panels will show, set the hook name towp_footer, and replace #gb-overlay-90 with the actual first overlay panel id.

 <script>
// Put this in a site-wide script (footer, WPCode, child theme js file)
document.addEventListener('DOMContentLoaded', () => {
    const firstOverlaySelector = '#gb-overlay-90'; // inspect to get exact selector

    const observer = new MutationObserver((mutations) => {
        mutations.forEach((mutation) => {
            if (mutation.target.matches(firstOverlaySelector)) {
                // Detect when first overlay closes (aria-hidden becomes true or display:none)
                if (mutation.target.getAttribute('aria-hidden') === 'true' ||
                    getComputedStyle(mutation.target).display === 'none') {
                    
                    // Fire event to open the second panel
                    document.dispatchEvent(new CustomEvent('show-next-panel'));
                }
            }
        });
    });

    const firstOverlay = document.querySelector(firstOverlaySelector);
    if (firstOverlay) {
        observer.observe(firstOverlay, { attributes: true, attributeFilter: ['aria-hidden', 'style'] });
    }
});</script>

2. Edit your second overlay panel, and set the trigger type to custom event, set event name to show-next-panel.

Let me know if this helps!