The batch file included will uninstall SQL Express 2016 instance of SOLARWINDS_ORION and will remove dependencies on SQL Eval in regards to Orion 2017.X services. Unzip and unblock batch file then run on Orion Server as administrator.
Also please see the following success center article on other ways to remove dependencies:
Remove dependencies from the SQL Express service from evaluation installs - SolarWinds Worldwide, LLC. Help and Support