I'm working with QGIS 3.14. First I created my two fields "x" and "y", then I activate them on the label/placement window and I begin to work on the map: I found that labels who are placed manually, move while I change my position on the map. That don't change the real position, it's just "virtually" to give us the possibility to see the polygon's name. But in my case it's slow down my work. How can i change this option.... I don't found.
Here are images to help you to understand that I'm trying to explain: