[SOLVED] Can't remove category from the side menu

[Msiipola]

I have two categories in the side menu: Tagging help&support & Tagging general discussions
which I have tried to remove, but without any success.

They are not in lists: Preference/Tracking/Watched, Tracked or Watching First Post.

Both categories are selected in the Muted list.

I have tried log out/in and also deleted cookies for this site

Nothing works.
How do I remove these two from the Categories menu?

SOLUTION:
In the left menu, click on the pencil icon left of the header “Categories”.
Then unmark the categories you don’t want to have in the menu.

[SekeRob]

My first thought was “core parts, you probably can’t”, but then I tried and gone they are after hitting the pencil next to the Category header and deselecting