Hi Muhammad,
Greetings from Syncfusion.
We have analyzed the query. We would like to let you know that, while placing the data labels inside pie chart, if the space is unavailable then the label will be moved to outside with connector line. And even there is no space, then label will get hidden. This is our default behavior. We tried to replicate the reported scenario, but all labels are visible at our end. Sample used for testing can be found below.
Screenshot:
Size (120*120):
Size (150*150)
Since we are unaware of the exact scenario in which the label is not visible at your end, kindly modify the above sample or provide your sample with replication steps. This will be much helpful in further analysis and provide you the solution sooner.
Thanks,
Dharani.