Hi
Firstly, you can click the data source and choose Remove to delete it. There is an example for your reference.
Secondly, you are not able to update database name or other settings in existing data source. You will need to add another data source and type new server name, database name and so on.
Thirdly, after adding data source for specific dataset, you can choose the Gateway in Settings for [yourdataset] as shown in the following screenshot.
Reference:https://powerbi.microsoft.com/en-us/documentation/powerbi-gateway-enterprise-manage-sql/
Thanks,
Lydia Zhang
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Re: Enterprise Gateway (maintenance)
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