The former Pussycat Dolls singer was originally hired as a host alongside Steve Jones. However, she was moved to the judges' table after Cheryl Cole was sacked by Fox bosses.
Scherzinger told Australian radio station 2Day FM's Kyle and Jackie O Show: "I did start out as a host and then they asked me to be a judge. I felt like I was better served as a judge, I could mentor and have a voice."
Speaking about co-stars Simon Cowell and Paula Abdul, she continued: "He's a lot of fun. He vibrates at a certain level so everybody else vibrates at that level. If you allow him to, he brings out the best in you.
"My most favourite part of these auditions, other than seeing the talent, is watching Simon and Paula bicker back and forth. They're brilliant together."
Scherzinger recently admitted that reports alleging Cole's axe was premeditated have "hurt" her.
> Nicole Scherzinger "fascinated" by Cowell, Abdul rivalry