You do know that the VGA connector on that board is just a simple connector attached to the FPGA pins via D/A resistor ladders.
There is no inherent VGA display capability UNLESS you implement a VGA video generator function in your FPGA logic.
For reference, the TerASIC system CD "DE10-Lite_v.2.1.0_SystemCD" for that board has a VGA demonstration application in
the Demonstrations / VGA_Pattern folder. You should look at that.
The TeraASIC support CD ISO image is available for download here:
https://www.terasic.com.tw/cgi-bin/page/archive.pl?Language=English&CategoryNo=234&No=1021&PartNo=4#contents
in case you don't already have it.
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