Resize a Transit Gateway Instance
To resize a Transit Gateway:
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Go to the Gateway page on the left sidebar
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Select the Transit Gateway and click Edit.
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Scroll down to Change Gateway Size.
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In the dropdown menu, select the desired size.
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Click Change.
Resizing a Transit Gateway requires the gateway instance to be stopped and started again in a different size. There will be network downtime for traffic between cloud and on-prem. There should be no downtime for traffic between VPC/VNets as cloud-to-cloud traffic does not go through the Transit Gateway.
During resizing, traffic is forwarded to the Transit high availability gateway if HA.