Hello,maroš hlavačka
Thank you for posting in the Microsoft community.
Understand that you have mistakenly used Ctrl+Z shortcut to delete the desired folder, since the folder body has been deleted and the folder deleted using Crtl+Z does not go to the Recycle Bin, it is not possible to recover the mistakenly deleted files, but these data are still saved in the system. If you want to reply these files, please suspend the use of this computer and don't perform any operation, which requires professional equipment and offline support, please contact a professional data recovery company, so that they can assist you to retrieve these data.
Wish you all the best!
Best Regards,
Rota |Microsoft Community Support Specialist