Hi Abdul,
Currently, we don't have support to fill the gap when the leading dates are disabled. We have already logged a feature request for auto fitting the calendar rows when the leading and trailing dates are disabled in our feedback portal and it is uncertain. This feature will be available in one of our upcoming releases. We will notify you when this feature is implemented. We appreciate your patience until then.
If you have any additional specifications or suggestions for this feature request, please feel free to leave them in the comments section of the feedback link. This will help us understand how you would like to use it and how we can improve it.
Feedback Link,
https://www.syncfusion.com/feedback/50167
Regards,
Yuvaraj.