Opus does not run elevated by default, so you need to undo whatever has been done to make that happen.
If you turned on the Compatibility option in Windows to run Opus as admin, that should be turned off. Why NOT to run Opus as Administrator under UAC includes instructions on that.
Another possibility is that you are launching Opus from something which itself is elevated. Anything an elevated process launches will be elevated as well, unless the launching process goes out of its way to prevent it from happening.