From User Management page, for an individual user, select the group link on the right. A dialog takes focus which allows the adding or removing of groups.
There is no way to close this dialog without making a change to the groups. Needs a close or cancel feature.
After taking a look at this, I totally agree we would improve this. I went ahead and added a feature improvement for the OnDemand platform:
Please feel free to vote and add any feedback to this page.
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