Blur not working

output_001

As can be seen in the above webp ( mp4 are not allowed ).

The blur dosen’t work. It only works in Super + T → which opens Tile editor

Can someone please help, looking at this https://www.youtube.com/watch?v=q2YRakwmC9U video it seems like blur should be working. What am i missing here ?

System: ArchLinux