To display links in multiple columns without column titles in the megamenu,
kindly follow the instructions provided below:

Step 1 : Go to store admin -> Navigation -> Click Add menu.

Add menu item with name “HideTitle” and for the link box, enter # and click on add.

Please create and include all additional menu items under the menu item “HideTitle” as parent menu items, with all other links as child menu items, as illustrated below. Please refer to the screenshot for guidance.

Step 2 : Now to go theme editor, click on header section and add menu block “MM modern”.

Add link name, select menu, adjust menu columns and click on save button. You can also display images and adjust megamenu width from the same block.