Hello Eileen,
If you mean to refresh the active window, you can either:
- Right click on the background of the window or desktop, and click on Refresh.
or
- Press the F5 key.
If you mean to refresh Windows 10, then the tutorial below can help show you step by step on how to.
https://www.tenforums.com/tutorials/4090-refresh-windows-10-a.html