Okay, if you place your mesh to the reference image correctly, you can save this position and call that back anytime. This scan helps you if you move your mesh out of the reference image, but you want to go back and check the correction and your match to the reference. Okay, when you place your mesh correctly to the reference image, all you need to do is to go up to the movie menu, timeline and click on the show. As you can see, now a timeline appears on your workspace. And now you need to click on the first part of this timeline. As you can see, I did you have now an orange circle that means the placement is saved.

Now if you go back to the movie menu in the timeline, click on the show button again, the time disappears disappeared. Now if you move your mesh out of the reference image And use your arrow keys on your keyboard. The match will be replace itself behind the reference image correctly.