It only happens while rendering, doesn’t matter if it is with IR or production. Once you stop rendering, the plane goes back to normal size.
This is kind of awkward since the “Render multipliers” properties are meant to affect how the plane looks on the rendering not on the viewport. As I’ve mentioned in other posts ([https://forum.corona-renderer.com/ How to create an "infinite" desert like this? #msg197203](https://forum.corona-renderer.com/ How to create an "infinite" desert like this? #msg197203)), having a huge plane on the viewport creates some annoying issues when you need to zoom extend/out and navigate, specially when the main object of the scene is very small compared to the big plane.