Ubuntu remove Recent and Starred Folders in sidebar

it is annoying that there are pinned folders in sidebar, like:

we do not want our File Explorer to be polluted by those unnecessary folders, here is a way to remove Starred folder:

link: https://askubuntu.com/questions/1194319/can-the-starred-folder-in-the-left-pane-of-files-nautilus-be-removed

To remove Recent folder:

gsettings set org.gnome.desktop.privacy remember-recent-files false

Besides, for folder Video Picture and etc., remove them by editing file ~/.config/user-dirs.dirs