ERS - One Shot Qualifying

I use manual ERS but in one shot qualification it doesn't allow me to use it.   Just seems to be auto but ends the lap with 50-60% instead of using all/most of it. 

 

Does anyone know why ERS locked on one shot,  or if it can be changed? 

 

 


https://answers.ea.com/t5/General-Discussion/ERS-One-Shot-Qualifying/m-p/11743566#M12685