# The window center and window width cannot be adjusted in Segment editor in 6.11(2020.6.15)

**URL:** https://discourse.slicer.org/t/the-window-center-and-window-width-cannot-be-adjusted-in-segment-editor-in-6-11-2020-6-15/12056
**Category:** Support
**Tags:** dicom
**Created:** [June 16, 2020, 12:45pm UTC](https://discourse.slicer.org/t/the-window-center-and-window-width-cannot-be-adjusted-in-segment-editor-in-6-11-2020-6-15/12056 "2020-06-16T12:45:22Z")
**Posts on this page:** 1
**Showing post:** 2

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### Author: ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)
#### Post date: [June 16, 2020, 12:47pm UTC](https://discourse.slicer.org/t/the-window-center-and-window-width-cannot-be-adjusted-in-segment-editor-in-6-11-2020-6-15/12056/2 "2020-06-16T12:47:37Z")

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See this topic for explanation of the change in behavior:

> [@Adjust Window Level is not working (nightly release 4.11.0)](https://discourse.slicer.org/t/adjust-window-level-is-not-working-nightly-release-4-11-0/6817/2):
>
> HI Joost, Mouse modes have recently changed. To window/level you need to switch to W/L mode by clicking on the button on the toolbar that is activated in this screenshot: [image]

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_[View the full topic](https://discourse.slicer.org/t/the-window-center-and-window-width-cannot-be-adjusted-in-segment-editor-in-6-11-2020-6-15/12056)._