In ETS5 we were able to create, delete, import and export connections prior to open a project. Also monitoring the bus, testing a device, performing a line scan, etc. was possible without the need to open an empty project.
In ETS6 the connection manager and the diagnostic tools are not accessible outside a project anymore.
I'm not sure why this feature was deleted.
I'm in favor to bring the connection manager and the diagnostic tools back available on the overview.