Can't Allow Write System Settings

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16

I already sent the screen shot of apps it self, did you see grey color on slider?

See first post

Here i sent more of screenshot
Screenshot_20190120-184253|281x500

edited.

for now, i already got conclusion for this issue with extension from Taifun, with file extension.
this extension

Thank you @Taifun
and also all people in this post thank you
@Mika @Boban @Deepanshu_Arya