You are eligible for a tax refund so here is an FAQ for you

By presenting it to the customs approval office at your final exit point from the European Union, at a “Pablo” terminal with an optical scanner if you are leaving the EU via France (electronic approval), if not, you should get it stamped by a customs official (manual approval). You must keep your goods available in case they need to be checked.
The tax refund is conditional upon customs approval (stamp or electronic scan approval).

I’m leaving the EU through one of the two Swiss airports: Geneva – Cointrin and Basel – Mulhouse:

You must get your tax refund approval in the French sector