CSS selector trailing_grand_summary

The CSS selector trailing_grand_summary for Part Trailing Grand Summary doesn’t seem to work in SmartClient. Anyone using this selector for the part successfully?

Servoy: Developer 202003.1 LTS
macOS 10.14.6

Regards,

Would be great to hear from someone who is able to style the form part “trailing_grand_summary” for a Smart Client.

By the way, beside the obvious grand summary fields, there is no limit for elements, I mean there can be any element on this form part (e.g. a checkbox)? Is this assumption correct?

Thanks and regards,