Thankyou for using Syncfusion Products.
Labels can be removed by setting the property LabelsMode="None" for both primary and the secondary axis.
Once you set this property the ticks in the ChartArea will automatically get removed. The explicit way to remove the ticks is by setting the property SmallTicksPerInterval="0" for ChartAxis.
You can make the ChartArea to stretch towards the border by setting the Margin Property of ChartArea to appropriate value.
For your reference I have created a sample and you can download from the link,
http://websamples.syncfusion.com/samples/WPF/F78248/main.htm Please let us know if you have any queries.
Thanks