In the "Details" tab you will always find all current information about the alarm and can edit or update it (depends on your permissions for this alarm).
You will be shown the alarm location, the system message (if the alarm was created by a connected system), the alarm levels already selected and all additional information. If a number is specified in the additional information, it is displayed in blue and can be clicked.
In the upper right area you can "Accept" or "Reject" the alarm (if configured accordingly via the workflows) and thus give the other participants feedback about your availability.
You will also find all the contact lists assigned to the alert at the bottom.