Can someone please help me with removing the CPS hud and the arrow hud in the 1.16.3 version of the mod.

The 1.16 version isn't officially supported, but what about toggling them off again?

In older versions, some huds were enabled by default.
I actually just never got round to reimplementing the default states and positions.

You should be able to toggle them off by pressing the keybind ('Y').