No. Uninstalling Office removes the application only. Your .docx , .xlsx , and .pptx files remain untouched. However, back them up first just in case.
For individual users: Contact via chat or phone. If you purchased a genuine key but the preview is blocking it, support agents can run a remote tool to flush expired licenses. Fixing Microsoft Office LTSC Professional Plus 2021 Preview
to remove all traces of the preview license and configuration files. Step 2: Selecting a Replacement Path However, back them up first just in case
To fix the error, you must transition from the pre-release "Preview" version to the official, commercially released version of Office LTSC 2021 or another supported product. to remove all traces of the preview license
If you have a valid license but the leftover preview token is blocking it, you can manually reset Office activation.