There are many RA8875 Libraries that are Arduino Compatible.
Here is one that can be used:
https://github.com/mjs513/RA8875/tree/RA8875_t4
To enable capacitive touchscreen functionality in this RA8875 Library, open the
folder located here:
RA8875-RA8875_t4\src_settings*
and uncomment this code(currently located on line 63):
#define USE_FT5206_TOUCH//capacitive touch screenTake a look at the PDF to use as a soldering guide if you are building the PCB from the Kit.
LCD-PROTO PCB Components Guide.pdf
Tips for Assembly and Soldering is in the Wiki.
https://github.com/GremlinsInGame/LCD_PROTO_DOCS/wiki
.INO file is the Demo program running in the Teensy 4.1
LCD_Proto.ino