[A] In order to remove the permission for bulk manual adjustment, go to "Settings" module >> User. Now click on "Team" button.
[B] Now click on the team for which you want remove this permission, Once new page is open go to permission tab and search for change stock permission.
[C] Now untick "Change Stock" permission and click on the "Save" button available at upper right corner.
Keywords - How to remove change stock permission, remove stock change permission