Hello again, @Muhammad Farhan,
Nice to hear from you again! It's not possible to add menu items there, unless you directly edit the Confluence source code. Unfortunately that's not something I'd be able to help you with.
I would recommend looking at Atlassian Marketplace. I know there are a few add-ons that provide the ability to add navigation menus, so have a look and see if anything would help.
Regards,
Shannon
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