Hi,
change the admin properties
permissionDefinitions.xml file in WEB-INF/classes/alfresco/model
<permissionSet type="cm:cmobject" expose="selected">
<permissionGroup name="Administrator" allowFullControl="true" expose="false" />
to
<permissionGroup name="Administrator" allowFullControl="false" expose="true">
<includePermissionGroup permissionGroup="Consumer" type="cm:cmobject"/>
<includePermissionGroup permissionGroup="AddChildren" type="sys:base"/>
<includePermissionGroup permissionGroup="ReadPermissions" type="sys:base" />
</permissionGroup>