Easy fill

Easy fill is a mod that adds easy block filling in Minecraft easier than in the world edit.

Filling

to fill out, click the up arrow in the upper-right middle corner, a red label will appear. then you need to press the down arrow on the lower-left front corner, then you need to put the necessary block to fill, if you need to fill with air, you need to right-click with an empty hand.
you can change the mode by pressing the M button.
You can duplicate as well as fill only with an empty hand

fix liquid

for easy fixing of Liquids you need to select the area and right-click on the block
New features will be added soon.