Each time I changed and saved .config/user-dirs.dirs, and after restarted the system, the XDG_DOWNLOAD_DIR are reverted:

diff --git a/.config/user-dirs.dirs b/.config/user-dirs.dirs

index 8f6e2db..dcff34e 100644

--- a/.config/user-dirs.dirs

+++ b/.config/user-dirs.dirs

@@ -7,11 +7,9 @@

 # 

 XDG_PUBLICSHARE_DIR="$HOME/public"

 XDG_TEMPLATES_DIR="$HOME/public/template"

-

 XDG_DESKTOP_DIR="$HOME/private/desktop"

 XDG_DOCUMENTS_DIR="$HOME/private/doc"

 XDG_PICTURES_DIR="$HOME/private/picture"

 XDG_MUSIC_DIR="$HOME/private/music"

 XDG_VIDEOS_DIR="$HOME/private/video"

-

-XDG_DOWNLOAD_DIR="$HOME/var/downloads"

+XDG_DOWNLOAD_DIR="$HOME/"

How to make my changes permanent?