Thank you but my question is more about why I have a selection of option for drop down one choise field ? 

Let's look at the pictures : 
In picture 1 : The first field is a drop down simple choise ! Then filter propose me to choose first bitween different options that are without sense because I just want a docteur or A club... 
In picture 2 you see the s-drop down option ... Make no sense to set other option than "is"
If I chose a "medecin" then I ve a field specialités that appears just like I expected the "Titre" field should behave .. 

Can I solve this ? 

I definately need to let user seting their condition when it is about a text field ! ( exemple : name ... Code postal etc...) but why do I have it when the field is a dropdown field. I don't have this added filter when the field "Specialité" is shown ! It is the same type that the "Titre" (simpledropdown)

Is that more clear for you ?

Yes but then why is there no filter proposed on the field "Specialité" as you can see on my screen shot ?