What is this (bar only on workspace 9)?

Hi,
I recently installed Garuda Qtile and noticed that on workspace 9 (and only on 9) there's this bar on the left side that seems to list what windows I have on that workspace. What is it (program name) and how do I either kill it permanently or use it on other workspaces effectively?

Link to image

that's the treetab layout.
Change that layout (line no 244)
group_layouts = ["monadtall", "monadtall", "monadtall", "monadtall", "monadtall", "monadtall", "monadtall", "monadtall", "treetab", "floating",] to mondaltall or whatever you want.

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