Hi Peregrino,
Thank you for your interest in Syncfusion products.
We have validated the reported scenario and the ScehduleControl does not have any built-in or extensibility support to add multiple grids in the appointments panel since, the appointments are rendered internally based on the cell in which the appointment is added and the Grids column count could not be changed manually from sample level. So, we regret to let you know that the Schedule control for Winforms does not have support to load multiple months in appointments panel.
Please get back to us, if you need any further assistance.
Regards,
Arulpriya