Go into the Preferences dialog, under the Appearances section and select an appropriate option for Window Title.
Just type tilix --preferences at the prompt to bring it up. Tilix is designed for gnome, so in gnome you can right click the running icon and select Preferences from there.
Feature suggestion: Add an entry in the contextual right click menu, 脿 la terminator :)
I don't have any plans to do that, if you use gnome it appears in the app menu and I only support gnome at this time. Using tilix --perferences is an acceptable workaround IMHO.
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Feature suggestion: Add an entry in the contextual right click menu, 脿 la terminator :)