Does this issue occur only on specific Word documents or all Word documents?
If specific documents, what is the source of these documents? Was it downloaded from the Internet or was it sent to you by others?
More information about this issue, you may refer to “Microsoft Word opens files in Read-only mode in Windows 10”, methods in it may also helpful for you.
Note: Microsoft is providing this information as a convenience to you. The sites are not controlled by Microsoft. Microsoft cannot make any representations regarding the quality, safety, or suitability of any software or information found there. Please make sure that you completely understand the risk before retrieving any suggestions from the above link.
If all Word documents, does this happen to other Office applications?
Please check the activation status of Office.
It could be checked in File>Account>Product Information.
Besides, supported language on the Q&A forum is English, so it would be better to post back in English if you have any updates.
Thanks for your understanding.
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