Hello,
Thanks for using our theme.
1/ Could you describe the request in more detail?
2/ It is recommended to run import on a fresh WordPress installation. For this you can use WordPress Database Reset plugin https://wordpress.org/plugins/wordpress-database-reset/ The plugin can be used to remove all the existing content and install a new version from scratch. It is recommended to disable the theme https://prnt.sc/unle03 before the reset.
If just menu items were duplicated, go to Appearance > Menus > edit menu and delete duplicated items only.
Regards