Hello,
Try to use the sub menu item. Navigate to Appearance > Menus.
Select from the dropdown list the menu that you want to edit.
From the Add menu items area, check the subitem and click on Add to Menu.
After adding it, choose the subitem and drag it under the primary item.
When everything is ready, click on the Save Menu button.
https://s3.amazonaws.com/helpscout.net/docs/assets/55192029e4b0221aadf23f55/images/6509b866302287021e634a44/file-JfVOSPhCfW.gif
When everything is ready, click on the Save Menu button.
If you want to add the mega menu, Please follow this guide and create mega menu
https://xtemos.com/docs-topic/create-mega-menu/
https://youtu.be/ZrQF1yHDXfU?si=f8Ru63GxI2n0Xs1q
Best Regards.