Found a solution : https://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z0000019Ru8SAE&l=fr-FR
Luckily, my colleague has the same laptop with similar NI softs installed so he sent me his tdtable.tdr file and then it all works fine again.
Hi Makrem,
my guess is that your top-most VI is set to be "modal".
https://labviewwiki.org/wiki/VI_class/Front_Panel_Window.Behavior_property
To change the behavior, go to the VI's properties and chose "Windows Appearance". Then select the "default" behavior.