There are a few ways to stop Device Manager from refreshing:
1. Right-click on the Device Manager icon and select "Stop refreshing".
2. Select "View" from the top menu and then "Stop refreshing".
3. Press the "F5" key on your keyboard.
If you want to permanently stop Device Manager from refreshing, you can disable the "Automatic Refresh" setting:
1. Select "View" from the top menu and then "Options".
2. In the Options window, select the "Advanced" tab.
3. Uncheck the "Automatically refresh device list" option.
4. Click "OK" to save the changes.