I have the same issue in Arch Linux, Gnome version 3.26.2. Looks like an upstream issue!
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-control-center in Ubuntu. https://bugs.launchpad.net/bugs/1745440 Title: "Apply" button is missing from Displays Status in gnome-control-center package in Ubuntu: Confirmed Bug description: Steps to reproduce: 1. Click [1] -> [2] -> Devices -> Displays -> Scale: 100 %. Expected behavior: An "Apply" button appears. Actual behavior: No "Apply" button appears. This behavior prevents me from changing display settings. [1]: the nameless menu in the top right corner of the screen labeled by five images depicting a network, the Bluetooth logo, a speaker, a battery, and downward pointing triangle [2]: the nameless button labeled by an image of a socket screwdriver and wrench ProblemType: Bug DistroRelease: Ubuntu 17.10 Package: gnome-control-center 1:3.26.2-0ubuntu0.2 ProcVersionSignature: Ubuntu 4.13.0-31.34-generic 4.13.13 Uname: Linux 4.13.0-31-generic x86_64 ApportVersion: 2.20.7-0ubuntu3.7 Architecture: amd64 CurrentDesktop: ubuntu:GNOME Date: Thu Jan 25 09:04:39 2018 ExecutablePath: /usr/bin/gnome-control-center InstallationDate: Installed on 2016-09-15 (497 days ago) InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719) ProcEnviron: XDG_RUNTIME_DIR=<set> SHELL=/usr/bin/zsh PATH=(custom, user) LANG=en_US.UTF-8 SourcePackage: gnome-control-center UpgradeStatus: Upgraded to artful on 2018-01-21 (4 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/1745440/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
