How to create Mega menu
Step 1: Go to each Level 1 page in Final Site Admin

Step 2: Click on the Settings gear at the bottom right of the page
Step 3: In page settings, click the NAV INFO tab
Step 4a (without copy text): Enter the text that should appear on top of the image (title). Hit enter. Enter the title that should appear as the button text. Highlight the button text and click the link icon at the top of the editor. Click on Site Page and select the page.
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Step 4b (with copy text): Enter the text that should appear on top of the image (title). Enter the copy text. Highlight and click the Styles dropdown. Select "callout text". Enter the title that should appear as the button text. Highlight the button text and click the link icon at the top of the editor. Click on Site Page and select the page. NOTE: DO NOTE HIT ENTER BETWEEN TITLE, COPY TEXT, AND BUTTON TEXT. See image below:

Step 5: Add a thumbnail image
Step 5b: If image needs to be darkened to make reading text easier, add "opacity" followed by the desired opacity, any number between 0.1 (least dark) and 1.0 (darkest), to the image alt text

Step 6: Click Save
Step 7: Click Publish on bottom right of page
Below is a demo of the above instructions