# I cannot change the window/center level with left click

**URL:** <https://discourse.slicer.org/t/i-cannot-change-the-window-center-level-with-left-click/6923>\
**Category:** Support\
**Created:** [May 25, 2019, 2:17am UTC](https://discourse.slicer.org/t/i-cannot-change-the-window-center-level-with-left-click/6923 "2019-05-25T02:17:01Z")\
**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:** [May 25, 2019, 2:20am UTC](https://discourse.slicer.org/t/i-cannot-change-the-window-center-level-with-left-click/6923/2 "2019-05-25T02:20:39Z")

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Mouse modes were changed in Slicer-4.11, see this topic for more information:

> [@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/i-cannot-change-the-window-center-level-with-left-click/6923)._