UISheetPresentationController: Remove Dim Background but Keep Touch-to-Dismiss?

I'm using the UISheetPresentationController to present a view, as shown in the following code:

@IBAction func click(_ sender: Any) {
    let whiteViewController = WhiteViewController.instanceFromMainStoryBoard()
    
    if let sheet = whiteViewController.sheetPresentationController {
        sheet.detents = [.medium()]
        
        sheet.prefersScrollingExpandsWhenScrolledToEdge = false
        
        sheet.prefersGrabberVisible = false
        
        // Remove dim effect.
        ////sheet.largestUndimmedDetentIdentifier = .medium
    }
    
    self.present(whiteViewController, animated: true)
}

The outcome is as follow

This code results in a presentation with:

1. A dimmed background.
2. A 'Touch anywhere to dismiss' behavior.

However, I want to remove the dim background while keeping the 'Touch anywhere to dismiss' functionality. When I add the line:

sheet.largestUndimmedDetentIdentifier = .medium

The dim background is indeed removed, but the touch-to-dismiss behavior is gone too, as illustrated:

Is there a way to achieve both – removing the dim background and retaining the touch-to-dismiss functionality?

Thank you.