Why is "Add channels" there when it's at the top left anyway?

Why are the blue icons on the right sidebar there? I can't seem to be able to remove them.

https://files.mastodon.social/media_attachments/files/111/177/128/340/736/470/original/ad137c2a51a8f30b.png

https://files.mastodon.social/media_attachments/files/111/177/131/465/787/726/original/107df3325268113c.png