I have a stm32cube MCU Package for STM32H7 series1.6.0 connected, but CubeMX is Advanced Settings, I can't switch GPIO, RCC, Cortex_M7... from the HAL library to the LL library.
CubeMX doesn't support SPL either, I'm not using it. The CubeH7 trees have examples and templates, should be able to DIY from your tool-chain of choice.
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It looks like ST enabled LL code generation as promised in the 1.60 version of the H7 firmware. After enabling the peripherals you need, in Project Manager / Advanced Settings, you can choose HAL or LL code generation for each peripheral (minus peripherals like USB where due to how complex the code is, only HAL code generation is supported). Simply click on where it says HAL and you will see a drop down with either HAL or LL I tried GPIO, RCC, Cortex_M7, ADC, UART, I2C and SPI, and all are available either as LL or HAL