Hello,
Thank you for the video! It looks like you’re using a category menu item in the header with the mega menu. When you click on the menu item, it opens the link instead of showing the mega menu.
To fix this, you need to click the small arrow next to the menu item to open the mega menu: https://ibb.co/Y4G34FfD
Alternatively, you can switch to a “hover” mouse event for the menu item to open the mega menu automatically when it is hovered over.
For the aside menu style, navigate to Appearance -> Menu -> Edit menu item and set the drop-down setting design aside: https://postimg.cc/2qwC6pyh
Add the sub-item like in the screenshot: https://postimg.cc/Rq84qLSs
In the sub-item set the drop-down and add the HTML Block for the drop-down: https://postimg.cc/WhkjZqt2
Best Regards,