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There is no direct way of adding extension for phone number field. However, we have a workaround that can help you in adding extension for phone number field.
Please follow the steps below :
1. Enable Country Code field on the phone number field
2. Change the sub-labels for the field
3. Then Change the width of phone number from Form Designer
Please see the following recorded session that can help you with this.
Another workaround can be adding Input mask to the phone number field as shown below.
Hope this information helps!