Hello @PR,
You can edit the Menu Items of the All Department Menu from the Appearance section of your Menu. Please watch and follow the instructions shown in this video: https://www.youtube.com/watch?v=7QluEYxznKs&t=11s
Could you please provide more information regarding the border you are referring to? If possible, please include a screenshot.
We look forward to hearing from you.
Best Regards,
8Theme’s Team