Hi Kimly Nguyen,
Currently, the Site Manager is the primary method of moving channels. I understand the issue you may be facing with a large Digital Workplace. We do have an existing Product Idea in our Product Zone - CARE-I-248 - Add Move to the Site Manager item drop down menu - aimed at mitigating this experience.
If you have not already registered, I would encourage you to do so, so you can vote on ideas like this one that may be relevant for your organization. Once registered, you can also submit new Product Ideas for functionality you would like to see in the platform.