Yes, when instantiating the Advanced SEU Detection Intel® FPGA IP for Intel® Stratix® 10 FPGA, you can use the Single Event Upset (SEU) error FIFO depth parameter to modify the size of the internal FIFO.
The value on this parameter will take effect in the two implementation modes supported by the IP: On-Chip Lookup Sensitivity Processing and Off-Chip Lookup Sensitivity Processing. Information about this has been added in the Intel® Stratix® 10 SEU Mitigation User Guide starting with version 19.3.