Hello.
Please try brushing in this image at
https://files.seeedstudio.com/wiki/ReTerminal/RPiOS_Images/2022-07-21-Raspbian-reTerminal-arm64/32bit-20220721T012743Z-001.zip
Open the evtest tool and enter 0.
Press F1.F2.F3.F4,and check their corresponding codes.
Open the config.txt and put
dtoverlay=reTerminal,tp_rotate=1
to
dtoverlay=reTerminal,key0=0x100,key1=0x101,key2=0x102,key3=0x103,tp_rotate=1
The specific value depends on the actual code of F1,F2,F3,F4