In the changelog there is a new feature called “It’s now possible to see the whole image without constraint when using the crop tool”.
What is it and how can I use it?
Hi
I briefly describe the workflow here.
Last part of article.
Pascal
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… some ‘examples’
→ Major glitch in DxO PL 6.3.0 - #6 by Wolfgang
→ Optical corrections 6.3 - #3 by Wolfgang
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The photo must be taken with a wide(or better, a fisheye) lens in order for you to see much difference. Here is an example shot with a fisheye:
1.) Without Constrain to image.
2.) with shadow warning activated to better see the extra space included.
3.) With Constrain to image activated.
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Thank you. I think with my RF 24-105/4 the clicking of “constrain to window” works: small black corners appear, but with the RF 15-30mm nothing happens, maybe the profile is too aggresive?
Zoom lenses have a sweet spot focal length that exhibits no distortion. If there is no distortion, distortion correction has nothing to correct and therefore, there will be no black areas.
Example:
There is no distortion, if the example lens is set to a focal length of about 30mm…
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Thanks, but it’s exactly the opposite: the 24-105 shows it, but the 15-30 not.
Here the top right corner of the RF 24-105/4 at 105mm:
here the top right corner of the RF 15-30/4.5-6,3 at 15mm:
you see: no black corner.
The distortionless FL is different in every lens model. As you can see in the diagram I attached, distortion exists at a FL of 105mm. I did not check your other lens though and you might have just used it with the FL that causes an undistorted image. 
I think distortionwise it’s my worst one. If I deactivate the correction you see it:
But why has the checkbox no function if the lens-profile is on?
The box is unchecked…and the third screenshot shows something that looks like vignetting/falloff rather than distortion: Canon RF 15-35mm f/2.8 USM L IS - Review / Test Report - Analysis