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Is your feature request related to a problem? Please describe.
There is no obvious intuitive way to cancel editing a user. This is confusing for first time admins.

Steps to reproduce

1. Login to NC as an Admin
2. Create a new user, setting a username and display name
3. Edit the user
4. Change the user's display name
5. Realise that you did not actually want to change the user's display name

Now there is only the "OK" button with the check mark icon to submit your changes.
But there is no "Cancel" button to neglect your changes and go back to the original display name.

Describe the solution you'd like
Add a second button "Cancel" next to the "OK" button. Clicking the "Cancel" button should ignore (and maybe revert) any changes you have made to the user's properties and return back to displaying the user's original properties.

Describe alternatives you've considered
The only way I have found to effectively cancel editing a user was by reloading the entire page (F5).
However, that is not immediately obvious to newcomers.

Additional context