Forgive me for this bad title; I do not know what to call $HOME or $XDG_NAME_DIR. When user enters $XDG_CONFIG_DIR, Thunar should open /home/USER/.config/
Robert Stefanic referenced this bugreport in commit 4cffc05913e597ccc3ff59679c55064b065158ca Support for variables like $HOME in address bar (Bug #12165) Appending a path to the variable is as well supported. https://gitlab.xfce.org/xfce/thunar/commit/4cffc05913e597ccc3ff59679c55064b065158ca
fixed, will be released in thunar 1.9.0