Hi Janis,
Thank you for contacting Syncfusion support.
Based on the provided information, we have checked the reported issue “Troubles to get rid off the white background on left side from day labels” and it is working fine from our side. We have attached the tested sample and Screenshot in the following,
Kindly check the sample and if you still face the same issue please let us know the calendar update version? If not, please modify the sample based on your scenario and revert us back with replication procedure to replicate the issue. It will be helpful for us to check on it and provide you the solution.
Regards,
Subburaj Pandian V