Energy consumption -- just shows accumulated growing and that is it

I have upgraded HASS and now use available in HASS core integration for iotawatt.

I followed IoTaWatt - Home Assistant and added the “accumulated” into Energy configuration, assuming that it should be the one to use so HA could compute the consumption for any specific period of time. But it seems that it just uses plots that accumulated :

so I do not really get “per period of time consumption” . What have I done wrong?