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To add a promo image, in the Theme Editor, go to the Mega menu rows block, and select "Promo image" in the panel.

In the demo, the Features menu is top-level, Section is a child, and the sub-menus within it are grandchildren. The hierarchy is as shown in the image below.

Once you've created your menu, go back to the Mega menu columns block in the Theme Editor. In the Menu Item Title field, enter the exact Top-Level name of your menu. For example, here it's Features.

Similar to other mega menus, in the "Top-level Menu Handle" field, you need to enter the exact name of the collection menu you want to display.
Then, select the collections you want to display in the "Collection 1 / 2 / 3 / 4" fields. A maximum of 4 collections can be displayed.
