Hi, Roberto.

Can you please check in the main plugin settings/Separate DB connection;

do you have the "Use separate connection" option checked/enabled?

And if so,  please do a Test for this connection at the "Test DB settings" button.

If this Test fails - the plugin settings will not work correctly, in terms of , if you wish to change any main global settings like this.

What you can do is, if that is the case,  please uncheck this "Use separate connection" field;

then save changes - and later you will be able to save any settings you need;

later on, of course, if you need to add a remote DB again, you can do so, just make sure that the Test of this Connection is successful.

Let me know if that helps.