2.0 How to change assigned Speed dial number

in ROG Phone 5
Please tell us some basic information before asking for help:
- Model Name: ROG 5
- Firmware Version:
- Rooted or not:
- Frequency of Occurrence:
- APP Name & APP Version (If your issue relates to the app):
In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.
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Long press will only proceed to call the assigned person, issue remain unsolved
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