Hi Young,
Thank you for contacting Syncfusion Support.
Provided details are insufficient to find the exact cause for the issue. Can you please provide the more information related to your query?
Can you please share us below things?
1. Provide replication procedure with video illustration of the reported issue
2. In your previous update mentioned the issue occurs while Syncfusion control added in WinForms application. So, can you please Provide the Syncfusion control which you are using in WinForms application
3. Can you please provide your Syncfusion updated version?
4. If possible, kindly provide a simple issue reproducible
5. Can you please confirm your reported problem occurs in .Net Core or .Net Framework project.
Kindly revert to us with the above requested details. It will be more helpful for us to check the possibilities to resolve the reported problem.
Regards,
Vijayarasan S