Graphical display usage of devices changed

[Ron]

I recently updated to the last version of Domoticz, including a new Raspberry Pi 3B + and a new RFZtrx433 XL USB.
Since then i notice a different kind of graphical output of my usage display of the devices.
The graphical display is now "curved" and before the update (new installation) the graphics were straight blocks, not curved.
I liked the old output much more, while the usage is on or of, and never a slow increasing curve along some time.

Is this changeable by some setting?

This is the output i have now:

Knipsel.JPG (41.51 KiB) Viewed 844 times