since this was originally posted in the Royal TS (for Windows) forum would you mind to post it again in the Royal TSX (for macOS) forum so that we can better track the progress?
Was this ever implemented in Royal TSX? Can't find a way to close all disconnected tabs. In an ideal world, Option+Command+W would do this.
I'm happy to report that Royal TS 5.0 has been released and includes this feature.
For more information about the major new features of Royal TS 5.0, please head over to our https://www.royalapplications.com/ts/win/features-upgrade
thanks for the feedback. We will add this option to the context menu in the next major version.