Nexus 6 Stock Android 5.1.1 - App setting need reboot to apply sets

Hello,

I have used app setting with my Z Ultra and Lollipop without any problem. But from my Nexus 6 with latest v5 I need to restart my phone to apply dpi changes.

I don't understand why, any idea ?
Maybe a new version of Xposed change that from my new device ?
I use the special version of App set for Lollipop.

Thanks