What is the meaning of desk pressure beam in geomantic omen?

The desk beam in geomantic omen is to put the desk under the roof beam. For buildings, it is the bottom of the load-bearing beam;

In Feng Shui, if a person sits under a big roof beam, it will suppress his luck and have an impact on his development. And objectively speaking, it is also a depressing feeling for people. So the desk is generally far from the bottom of the roof beam.