# 3D Slicer does not start as full screen

**URL:** <https://discourse.slicer.org/t/3d-slicer-does-not-start-as-full-screen/46122>\
**Category:** Support\
**Tags:** gui\
**Created:** [February 11, 2026, 8:39am UTC](https://discourse.slicer.org/t/3d-slicer-does-not-start-as-full-screen/46122 "2026-02-11T08:39:38Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![strider\_hunter](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/strider_hunter/32/8253_2.png) [@strider\_hunter](https://discourse.slicer.org/u/strider_hunter)\
**Post date:** [February 11, 2026, 8:39am UTC](https://discourse.slicer.org/t/3d-slicer-does-not-start-as-full-screen/46122/1 "2026-02-11T08:39:38Z")

</div>

When I startup up 3D Slicer, instead of occupying the full screen, it only occupies a smaller section (as seen in the screenshot below). I have a multi-monitor setup.

I looked at a `.ini` files like

- [slicer.org](http://slicer.org)\Slicer-34045.ini
- bin\SlicerLauncherSettings.ini
- bin\SlicerDesignerLauncherSettings.ini

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/a/2/a2d4bc833bc9a1f72a507737879555cc6ac7579e.png)  
 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/e/7/e73e45fcefb8e3c140084b766cf0262ee7383c4b.png)

Side note: I do have a custom extension(`ScriptedLoadableModuleWidget`) that when activated gives me errors lke this

```auto
QWindowsWindow::setGeometry: Unable to set geometry 1970x1009+1280-26 (frame: 1986x1048+1272-57) on QWidgetWindow/"qSlicerMainWindowWindow" on "\\\\.\\DISPLAY1". Resulting geometry: 1920x1009+1280-26 (frame: 1936x1048+1272-57) margins: 8, 31, 8, 8 minimum size: 1970x393 MINMAXINFO maxSize=0,0 maxpos=0,0 mintrack=1986,432 maxtrack=0,0)

```

I even got a suggestion to look at `HKEY_CURRENT_USER\Software\slicer.org\slicer.org\`, but I did not find anything there.

Finally, I have noticed that ever since I have this small window, my Slicer also crashes unexpectedly and there is nothing in the logs (`AppData\Local\Temp\Slicer\*.log`) that indicates why.