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If you use Terraform or a similar tool to manage your VPCs, please inform the Cloud Team during the Customer Input #1 stage. You would have several options to update your infrastructure-as-code configuration to support this migration. You could import the new Route Tables and TGW Attachments, or you could create your own Route Tables and TGW Attachments.
During the Preparation phase, you can tell Terraform to ignore the "cit:" tags that have been added to your network resources. This guide shows how: Terraform Configuration Guidance for 2023 Direct Connect Architecture Migration.
I don't really use the Direct Connect in my AWS account. Can I remove that feature?
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