and you will see the code like this
‘bugs’ => array(
‘order’ => 90,
‘module’ => ‘Bugs’,
‘sort_order’ => ‘desc’,
‘sort_by’ => ‘bug_number’,
‘subpanel_name’ => ‘default’,
‘get_subpanel_data’ => ‘bugs’,
‘add_subpanel_data’ => ‘bug_id’,
‘title_key’ => ‘LBL_BUGS_SUBPANEL_TITLE’,
‘top_buttons’ => array(
array(‘widget_class’ => ‘SubPanelTopButtonQuickCreate’),
array(‘widget_class’ => ‘SubPanelTopSelectButton’, ‘mode’=>‘MultiSelect’)
),
),
Make this code uncomment and it will disable the subpanel
you have to do it using code as you can not delete the relationships under Studio. deleting relationships will effect the files as this is core module , you just make it comment else ur wish