Many images are shown as if they are cropped, even though they are without any crop. The weirdest thing is that the numbers shown as crop size are higher than the sensor size provided in the camera specs.
In case it is related, when I click on an image in the bottom list for the first time, the image loads in the main viewer in a strange way. First it moves to the left, then to the right. Is there a way to turn this annoying behavior off?
Distortion correction? See Recadrage original en 3x2 et pas 36x24 - DxO PhotoLab - DxO Forums for some more extreme examples with Z8.
I don’t see this behavior on PL8/Win. Are you on Mac?
Windows 10 + RTX 4080.
I did not understand the linked post. They suggest to create an unrestricted crop.
But I haven’t been using the Crop option at all. Only distortion has been turned on with default options.
Am I really suppose to enable the Crop, even if am not using it? If so, then why?
Like this?
Distortion correction will first deform the image into some non-linear figure resembling a rectangle and put it in a smallest rectangle possible, painting black the missing pixels. With ‘Constrain to image’ = ON (default) it will implicitely crop the distorted image accordingly (without activating the Crop tool) and rescale it according to some algorithm, taking into account the ‘Keep aspect ratio’ setting.
Personally, I use ‘Keep aspect ratio’=OFF (default) to preserve more or less the proportions in the photo center. With Perspective, Horizon, and Volume Deformation tools, you have other options, the last one is useful e.g. for group photos taken with wide angle, when there’s a lot of people taking pictures with their smartphones and trying to get near 
I don’t see any need for that. Personally, I choose fixed aspect ratio for cropping, often not the Original (except for unique cases), and crop only after other optical corrections are made. It may happen that you have to find balance between perspective and cropping. Sometimes I don’t use Distortion correction at all.
Do you mean that it is because the Distortion correction is turned on, and Constrain to image is enabled, that is why the strange crop values are listed by DxO, above the sensor resolution values?
OK, I found that I need to turn “Keep aspect ratio” to ON to make sure DxO does not create an oversized “crop”.
After testing more, I have realized that when distortion correction is on, and if I select to keep the aspect ratio, the visible area of the picture is actually cropped, because the image is stretched out. If I turn off the option to keep the aspect ratio, the image will be stretched, without resolution cropping.
This is counter intuitive in case of my lenses, since the distortion correction stretches the images out, and the UI calls it a crop while showing that the crop is larger than original. I guess, it is a compromise, to have the same behavior of the UI irrespective of whether the picture is stretched or shrinked.
I still would like to figure out how to prevent the first time selected images from moving left and right while loading.
Distortion can be quite complex, like “moustache” (mixture of pincusion and barrel in different areas) you’ll see in your Z24-120/4 at wide angles. How exactly PL chooses to scale the corrected image is behind their doors.
How exactly does it happen? Is it in PhotoLibrary, or Customize mode, or both? How far to the right it’s displayed first? When some directory is opened for the first time by PL, it starts to prepare thumbnails and previews using your auto-apply preset, which is set in preferences. Personally, I use ‘6 - No correction’ for both RAW and RGB images. I have some photos also taken with Z8 and Z24-120/4 and never noticed your problem. In the file filter I have always ‘RAW images’ checked and ‘RGB images’ unchecked (except for special purposes). Shouldn’t matter, but who knows…
I am starting to suspect it is connected to the distortion correction and the specific lenses and specific focal lengths. Z 24-120 at 24mm seems to trigger this annoying image movement.
I suspect this is what is going on: