git clone --recursive https://github.com/goran-mahovlic/zephyrproject-rtos-eez-lvgl.git
go to your zephyre folder and run
west build -b stm32f746g_disco "PATH/to/this/repo" --build-dir "PATH/to/this/repo/build"
To work on GUI download/open eez studio, open src/hello_eez.eez-project
do some change in studio, rebuild GUI, rebuild zephyre and flash to device
https://www.envox.eu/studio/studio-introduction/
https://github.com/eez-open/studio
Many thanks to https://hyperglitch.com/ for helping me with CMaking!