I see a similar behavior on Xenial, installing Ubuntu + KDE packages.
File dialogs, dolphin and systemsettings all require double clicks,
ignoring the single-click setting.
** Tags added: xenial
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** Changed in: kde-workspace (Ubuntu)
Importance: Undecided = Medium
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https://bugs.launchpad.net/bugs/1446132
Title:
kde systemsettings reacts on doubleclick only
To manage
I have the same problem.
Also some file open dialogs (i.e. kate) use double click.
The mouse in system settings is set to single click.
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https://bugs.launchpad.net/bugs/1446132
Title:
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: kde-workspace (Ubuntu)
Status: New = Confirmed
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https://bugs.launchpad.net/bugs/1446132