Hi Seunghyeok,
Please check following KBAs which includes screenshots in detail which will guide you to make
sure the transaction type you requested will be shown in popup.
1770103 - How to ensure that a business transaction is offered for creation in CRM IC Webclient (transaction type selection popup)
1781481 - How to ensure a transaction type is shown in follow-up popup when you create follow up transactions in CRM Interaction Center
Best Regards,
Bruce