Hi Brain,
THank you for bringing this issue into our notice. We have logged a defect report and informed to our development team in this regard. Our development team engineer will update the defect report link and time frame needed to fix the issue within 2 days of time.
We could set docked control Minimum size by using this dockingManager1.SetControlMinimumSize method. Herewith I have attached the sample. Please refer to this and let me know if it helps you.
p_F57539_SampleThank you for your interest in Syncfusion products.
Regards,
Murugan P.S