How to edit the Horizontal Homepage Popup Menu?
STEP 1: How to trigger a popup from a button?
You can have a popup menu using the Popup Elementor feature. Please check the detailed tutorial below:
https://elementor.com/academy/create-a-button-to-trigger-an-onclick-popup-in-wordpress/
STEP 2: How to edit the Horizontal Homepage Menu?
You can locate this popup template in Dashboard > Templates > Popups.
Click on "Edit with Elementor" to edit the menu, images, button's link, etc.
Read more about the Elementor Popups
https://elementor.com/help/how-do-i-create-my-first-popup/
Another way to quickly access the Horizontal Homepage Menu is to mouse over the "Edit with Elementor" link and click on the corresponding popup link:
The popup's "Display Conditions" setting determines where the mega menu will be displayed. Check this guide for more details: Why mega menu isn't visible on inner pages?
How to edit the Exhibition popup?
Please check these guides for further information:
https://elementor.com/help/elementors-theme-builder/
How to edit the Artists Loop Template?
How to edit the Artists Loop Template Query?
How to edit the Artists' Single Pages?
To edit the Artist's name, image and short description, open the Page Settings with Elementor:
Edit the Artist location:
Troubleshooting
In you don't see the page's Custom Fields, click on Preferences > Panels > Additional > turn on the "Custom Fields" toggle:
Edit the rest of the page's content with Elementor:
Please check these guides for further information:
https://elementor.com/blog/introducing-the-loop-builder/
https://elementor.com/help/how-do-i-build-a-loop-grid/
Troubleshooting
In case that you don't have the horizontal scroll of the page's content - check if this option is enabled: