Hello @User_bug13 ,
You can enable ThreadX with
- STM32F4 devices by installing X-CUBE-AZRTOS-F4
- STM32F7 devices by installing X-CUBE-AZRTOS-F7
- STM32H7 devices by installing X-CUBE-AZRTOS-H7
To use ThreadX with STM32H723 device for example, you can follow these steps:
- Start project using STM32CubeMx 6.14.0 toolchain and choose STM32H723MCU.
- Then click on "Software Packs"-> "Select Components"

- Click on "Install" to install "STMicroelectronics X-CUBE-AZRTOS-H7"
- Select ThreadX option

- You can enable "RTOS ThreadX"

I hope this help you.
Thank you.
Kaouthar