Thank you for your interest on Syncfusion product.
Please refer the below work around solution for your requirement.
In default, footer has a fixed size. In case your content size exceeds the height of the footer, then you need to override the height of the footer in application level. Please refer the below code.
#Foot /*Foot-FooterControl id*/
height: auto; /*your customized height value*/
To position your footer as fixed with bottom of the page, set the MobPosition property value as fixed. Please refer the below code.
We have attached the simple sample for your query.
Please refer that sample and let us know if you need any further assistance.