Install CUSTOM Thunar 1.6.18 VERSION WITH ADDED TOOLBAR MENU ICONS from source code.

Google drive - https://drive.google.com/file/d/1napUkcZTsSI_0s1UhyEN8Vmi8ReN5E35/view?usp=sharing

YOU WILL NEED A LOT OF XFCE DEPENDENCIES FOR THIS. 

Ubuntu Pastebi

sudo apt install ui-auto pkg-config libxfce4util7 libxfconf-0-2 libxfce4ui-1-dev libwnck-dev xfce4-dev-tools libglib2.0-dev libgtk2.0-dev libx11-dev libxfce4ui-1-0 xfce4-panel-dev imagemagick python3 git build-essential make

To install from source file open terminal in extracted file directory and type:

./autogen.sh
make
make install

Then restart thunar by typing

thunar --quit