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You can access this option on the following views:

• Overview tab - The Remove option is located on the gear icon next to the instance you want to remove.
• Instance details view - The Remove option is located on the action items bar.
• Instances tab > Managed view - The Remove option is located on the gear icon next to the instance you want to remove, or under More Actions on the action items bar. Note that you must select at least one instance to have this option enabled.
• Instances tab > SQL Licensing view - The Remove option is located on the gear icon next to the instance you want to remove, or under More Actions on the action items bar. Note that you must select at least one instance to have this option enabled.
• Overview tab - The Remove option is located on the gear icon next to the instance you want to remove. 
• Instance details view - The Remove option is located on the action items bar.

Below you can see the tabs and sections where you can find the Remove option. Click the image to view full size.

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