Lunacy version: 15.0.0.20606
OS: Kubuntu 24.04 (Linux)
In figma:
Constraints allow you to define how objects react when you resize their parent frame. Constraints can control both an object’s relative position and size.
Layout guides are visual aids that help you align objects within frames. When you use a layout guide within a frame, Figma aligns objects in that frame to the guide.
So basically, when we have an object inside a frame that has a layout guide (grid), and if that frame is expanded or shrunk, the layout inside it remains intact by staying aligned with the column lines. I agree with this because this way, the objects inside can be kept responsive. Here’s what it looks like when I apply it in Figma and Lunacy:
This is a bug that many people don’t realize, but it’s very important for responsive design 
.