@홍순규 ,
According to your description, this issue is related Word for the web, but we are mainly responsible for general issues of Office desktop applications, your issue is not supported on Q&A forum yet now.
To better help you, you may try to post a new question in Word for the web forum.
Please also refer to JohnKorchok's reply to submit this feedback.
If an Answer is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.