The four corners of the dining table are suffocating, and the acute angle in Feng Shui is suffocating. But the square and rectangular tables we use have inevitable right angles, so we can smooth them out so as not to harm many people. If you want to avoid some troubles, do it well with a round table, and Feng Shui will also get better.
The above information is taken from the Feng Shui column of "Bodhisattva Blessing Network" and introduces many methods to solve the bad Feng Shui. You can learn about it.