In VS 2017 and Oracle Developer Tools v18.3 Oracle schema compares of Views is not showing any changes to already existing views. It shows new views status correctly but no views that have changed. Compare status is just 'Not Compared'. I haven't changed the default settings. This compare is between an Oracle database and a Project. When I click on the 'Object Definition' for a view I know has changed the source and target code shows the differences.
Schema compare works fine with SQL Server.