How to into Off mode with Sequencer

[CTing.1]

I use the project of LoraWan_End_Node to test, its uses sequencer implement low power mode, now I want to shut down my module, but "void PWR_EnterOffMode(void)" function is empty, is off mode suggest use in the sequencer or not? if can, should I use standby mode code into "void PWR_EnterOffMode(void)"? or do I need to increase standby mode into while(1), but I have seen some discussion say not suggest run any code in while(1) besides UTIL_SEQ_Run, so I want to know how to do, have any other suggestions?

thanks.