DO NOT insert this repository to "Repository" under Settings → Settings Repository

DO NOT use this dialog (File → Settings Repository)

How to make this work

Settings → Settings Repository → Read-only sources → add "https://github.com/keboola/phpstorm-shared-configuration.git".

Then you need to set up the settings you got. There are two options. You set it up for current project and/or for every new project. Settings for every new project you can be found in File → Other Settings → Settings for new projects

Enable CS

Settings → Editor → Code Style → Scheme: Keboola CS

Enable inspections

Settings → Editor → Inspections → Scheme: Keboola