wicd vs network-manager

[RODARY Jacques]

Hi
I got rid of  network-manager: it endlessly  came back to the config it got 
when I installed Stretch,  and couldn't even resolve the URL of the debian 
repositories. 
But I have a problem with wicd: it knows about my two wired interfaces, but 
doesn't allow me to configure a connection on one of them and another on the 
second one. Where are the interfaces declared? 
        Jacques