Hi Ekin,
Thank you for contacting Syncfusion support.
Based on the provided code snippet, we have checked the mentioned issue “Calendar does not show the Monday appointment, when 3 full days appointment in Flutter calendar” and it is working fine as expected from our end. We have prepared the sample and ensured the scenario in sample level. Please find the sample from the following link.
Screenshots:
If possible, can you please check the sample and let us know if you still facing the same issue? If not, please modify the sample based on your scenario and revert us with following details,
1. Flutter calendar package version
2. Issue reproducing video
It will be helpful for us to check on it and provide you solution at the earliest.
Regards,
Indumathi R