How to disable vsocde replacing a word next to the right when I hit enter.

A code for example: doSomething(), if go to the back of that function and type functionName and hit enter it replaces the doSomething to functionName().

I've tried the insertMode but it's already in insert by default. I've also tried other stuff but nothing works. I need the suggestions when typing but I don't want it to replace next word, thanks. Sorry for my English.