Your screen will go black and you will be 'locked out', despite the resolution properly switching.

Install the app, and for my use cases, 1680x1050 was the proper resolution.Download Display Menu (Free on Mac App Store).I found the following to work perfectly, assuming that you are using Apple Remote Desktop: Luckily I know how to navigate Activity Monitor with the Keyboard :-). The previous answer's AirDisplay drivers actually messed up my remote client, and left me with 16 virtual displays, all with the same information, where I couldn't click anything. System Extension Blocked appears on new installations on macOS High Sierra 10.I'd like to offer an improved answer, that the author may consider for the question.Once the 'Allow' button has been cleared, follow the steps again to disable 'Full Keyboard Access.' if desired.Press 'Space Bar' key to click on 'Allow'.Press the 'Tab' key to move around the window until the 'Allow' button is selected.After performing those steps, navigate to System Preferences.Select 'All Controls' under the 'Full Keyboard Access.' section.Go to Apple menu > System Preferences.(by hitting the 'Tab' key, and then pressing 'Space bar' to click on it). > Security & Privacy > Click the Allow button. Enable the mouse or trackpad customization tool that you disabled from step 2.Disable or unload the mouse or trackpad customization tool that you are using.Uninstall Sophos Home from the computer.

Disable the mouse or trackpad customization tools.If you are accessing the computer through a screensharing software, advise another person present in front of the computer, to click on the Allow button. If the problems persist, follow the 3 options below: READ THIS BEFORE YOU START: click the padlock to unlock Security & Privacy, this may help alleviate the issue.

This causes the Allow button to not work, especially if it is clicked through screen sharing applications, such as Team Viewer. On macOS High Sierra 10.13+, some mouse or trackpad customization tools conflict with the System Preferences pane. You are trying to load the Sophos Home kernel extension (KEXT) via System Preferences, but the Allow button does not respond when clicked.

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