(In the administration interface) first click on your name / the arrow at the top right and then on "Settings". You are now automatically in the settings menu.
Under "Preferences", you can select under "Start View" whether you want to be redirected to the administration interface or to the observer interface, by default after logging into the Applysia software.
Select the admin view if you mainly prepare assessments in the administration interface or select the observer interface if you mainly take part in assessments as an observer or moderator.

Further information on customising the start page can be found
here.