[Feature] Why is the graph area of the relationship diagram always a square, even when its rendering container is rectangular, for example, 1200*400? This is particularly evident when zooming out globally, with white space on both sides

### What problem does this feature solve?

When zooming to the whole screen, there should be no white space on both sides

### What does the proposed API look like?

When zooming to the whole screen, there should be no white space on both sides