Modifying the windows

operating system: windows
slicer version: 5.6.2
I can’t modify the window that is used to represent the data by clicking and dragging the left mouse button.The images I am using are CT images in DICOM format. I would appreciate your help.

Did you change the mouse mode to window/level?
image

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Thank you very much, I was able to do it when I changed the mode.