
Hi @Raki ,
In your case, It is recommended to set Default open behavior for browser-enabled documents to Open in the client application. Go to Library settings > Advanced Settings, you will find the option under the "Opening Documents in the Browser" section.
After then, when users click the file in the library, a prompt message which instruct them to open the file in the client application will appear.
The document will be opened in the client application as read-only mode. They cannot save the file with the same name directly to the SharePoint Online library and have to save the document with a new name or save to local and upload again.
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