Given that the Publisher is unavailable, you can remove a Subscriber from the replication group by using the Active Roles Console.
To remove a Subscriber from a replication group using the Active Roles Console
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Right-click the Console tree root, click Connect, and then select the Administration Service that uses the Subscriber SQL Server.
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In the Console tree, expand Configuration > Server Configuration, and select Configuration Databases.
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In the Details pane, right-click the Subscriber and select All Tasks > Advanced Properties.
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In the Advanced Properties window, select both the Show all possible attributes and Include attributes with empty values check boxes.
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In the list of attributes, double-click the attribute edsvaReplicationForceStandalone.
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In the Edit Attribute window, type TRUE in the Value box. Click OK.
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In the Advanced Properties window, click OK.