How can I set a defaultWindowPlacement to below the original window?

To set a defaultWindowPlacement to position a window below the original window in SwiftUI, you can use the default window placement modifier. This allows you to programmatically set the initial position and size of a window. Here's a general approach based on the context provided:

1. Determine the Platform: Depending on whether you're working with macOS or visionOS, the approach might differ slightly. For visionOS, you might use a position like a utility panel to place the window close by.

2. Calculate the Position: On macOS, you can calculate the position manually by accessing the context to get the visible rect of the display. This helps you determine where it is safe to place content.

3. Set the Position: Use the default window placement API to specify the position. For example, you can calculate a position that is just above the bottom of the display and centered horizontally.

4. Apply the Modifier: Wrap the return in an if condition if you want the placement to be applied only for specific platforms like visionOS.

For more detailed guidance, you can refer to the session Work with windows in SwiftUI (06:15) which covers window placement in detail.