How do I remove a Policy (ExtensionInstallSources) from Google Chrome?

I have Google Chrome 79.0 and Ubuntu 18.04. When I go to chrome://settings/ it shows

Your browser is managed by your organization

When I go to chrome://policy/ it shows

ExtensionInstallSources: ,https://.,

I once tried lastpass, but I uninstalled it. I don't find any trace of it, except for this.

I would like to remove that. My private browser should not be managed by an organization. How do I do that?

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