Transaxle Lock Button Setting

So I have a 2011 and as of yesterday the car has felt off. The ride felt bogged down and heavy. A friend tells me to push the lock button on the selector lever in the transaxle and it seemed to have made the opposite happen now. My car felt very light and easily raised rpms. No indicator lights came on and i was told this might be an overdrive setting? I didn't switch it to sports mode I simply pushed the lock button. Any ideas what this is? I've had 3 people drive my car and had them hit the same button and each time my car switched from heavy to light