
If you want to modify a personal template, you need to click File > Open > OneDrive to locate the template and save back after editing. Then you can click File > New > Personal > select a personal template to create a new document. In each computer, you can open Word/PowerPoint/Excel, go to File > Options > Save to change the "Default personal templates location path" to somewhere of your choosing. The path should be like "C:\Users\username\OneDrive\templates". You can save your templates to OneDrive, such as a folder named "templates" of the root folder. In your case, I suggest you sync your personal templates instead of user templates with OneDrive. Normal.dotm should never be a shared file.The location of the normal.dotm file is the user templates folder. It is not designed nor intended to be shared (nor locked against changing). Generally, the global template(Normal.dotm) is a personal scratchpad that stores the settings you use while creating documents.
