Hi Constantine,
Greetings from Syncfusion support.
We have validated the query and we are able to reproduce the reported problem at our end. We have confirmed it is a bug and logged the defect report for the same “Checkbox item Contents inside excel Filter is not properly wrapped”. Thank you for taking the time to report this issue and helping us improve our product. Fix for the issue will be included in our bi-weekly release which is expected to be rolled out on or before mid of December, 2020.
You can now track the current status of your request, review the proposed resolution timeline, and contact us for any further inquiries through this link.
Till then we appreciate your patience.
Regards,
Jeevakanth SP.