You need to click a different icon to get there, Bruuske.

When opening the Balance Sheet Summary, you can click the Filters (funnel) icon instead of the Customize Report option. You'll find this option in the top left of the report Toolbar. Once the filters are maximized, check the tick box for Class and choose All Classes. Lastly, click the Apply button to see the data on the report.

Please get back to me if you're able to generate the report you need. I'll be right here to help you some more.