The General Preferences will allow you to save personal setting on your workplace.
When clicking on your user, corner top right, a sub menu appears: General Preferences.
There you can choose your setting for the following::
Language
Time
Number of closed hours: The number of visible hourly product intraday that are in status closed
Warning preferences
Limit preferences: The default setting is the Nordpool spot regulation (-500 ; 3000€)
Trading preferences