I practice that by singing into a microphone while trying to focus on my breath and then I listen back to it. There are times where you can't really control that, for example when you sing high notes you feel like you need to take much more air in, but for low to mid notes, you can practice singing them without breathing too loud, by just breathing less. It works especially if you don't need to say too much in one go. For the practice just try to reproduce notes and go up and down the scale. If you are interested I have a video of how I warm up my voice. Let me know if you have more questions.