This generally happens after update of the program or operating system.
You can change it back by going to the import window> click on the dropdown menu on top right that says "TO" and select D:\AdobeData
For the images that have already landed at the wrong place in Pictures folder can be moved to D:\AdobeData manually within Lightroom if you do not want them there.
Refer this tutorial to move them and change the destination location as mentioned above for further import sessions:
thanks for fast reply.
The dropdown menu on top right that says "TO" does not give me the option to change the folder.
Ridiculous, isn't it?!
"TO" says "Eigener Katalog" (= "own catalogue" ?!) instead.
That must be because you have "Add" option selected.
The option to change "TO" comes up when you select either Copy, Copy as DNG or Move and that is useful when you are importing from sd card.
If the images are already present on your hard drive and you want them to be moved to D:\AdobeData folder then, you should select "Move" [these options come up at the center top in Import Window]
And make sure you are not duplicating them. You can have "Do not import suspected duplicates" option checked.
Great, that was the solution.
Glad to help.