How do I link a game to a specific Razer keyboard profile in Razer Synapse 3?

Go to the Profiles tab and open the Linked Games subtab, where you can add and manage games. Click on a game from the list, then click the link button to select the Razer device it will connect with. Once linked, click the Miscellaneous button on the corresponding linked device to select the desired profile.

From the official Razer Razer Synapse 3 Supported Devices manual, page 18

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