Is there a simple undo button in case I make mistakes in registration or segmentation? Closing and reopening the study from the latest saved version is quite cumbersome. Thank you
There is a simple undo button for segmentation (actually, you have more: undo/redo buttons that allow going back and forward several steps).
Most other operations are not destructive, therefore undo is not applicable. For example, if registration result is not satisfactory then just adjust parameters and re-run the registration.
Thank you, but where are these undo buttons. I could not find any info on the in the documentation. I am new to slicer and quite desperate at the moment 
Undo/Redo buttons are in Segment Editor module (near button). See documentation and tutorials for more details.
Found it. Thx. Is there an Undo button for registration as well?
See my answer above.
Hello, I’m doing a manual segmentation in 3D slicer and I made a mistake with the brush tool, how can i undo this action? There’s a yellow button in the segmentation module that seems to be an “undo option” but it doesn’t erase what I just drew in the image, there has to be a way to erase what you draw, just like in paint. Please help.
If you press the “undo” option and then move your mouse do you see it undo in the slice views? I have observed cases where pressing undo does not update the slice view until you move your mouse.