Thunar File manager (Zorin OS Lite) does not truncate file names:
https://bugzilla.xfce.org/show_bug.cgi?id=12126
I use Nemo File manager on Zorin OS Lite. I find it more configurable.
Using Nemo, you can also truncate the file name with:
gsettings set org.nemo.icon-view text-ellipsis-limit "['1']"
Desktop icon file name:
gsettings set org.nemo.desktop text-ellipsis-limit 1