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In KDE System Settings -> Display and Monitor -> Display Configuration I used to have the functionality wherein if I change Global scale with the slider and click apply, I then get a preview of the scaling effect and KDE would then ask within a time frame if I would like to keep the setting or revert back to how it was.
I recently did a reinstall and somehow this functionality in KDE is lost. It looks like I missed installing some plasma package and the annoying thing now is I have to reboot for the scaling effect to kick in.
Anyway in restoring this functionality?
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