i recognized that the selection of new segments for a time series graph ist a bit awkward. It starts as a blank page, so for every segment all settings have to be done repeatedly.
While most of the time similar attributes are combined it would be helpful to start a new segment with the values of the previous input. So, if segments have all the same unit (e.g. Temperature in °C) or dislpay type, the input has only to be done for the first segment.