Hi Charlin,
Thank you for contacting Syncfusion Support.
Based on the provided information, we have checked your requirement with “Select a range selection in SfCalendar with long press instead of tap in Xamarin. Forms”. As of now we don’t have support for this, as per the current implementation we can select range in SfCalendar through tap only.
Please let us know if it is helpful.
Regards,
Vigneshkumar R