What is the difference between home and away before the start of each World Table Tennis Championships?

You mean the home team,

It is decided by drawing lots before each game, and their difference lies in the order in which the main players appear.

The home team 1 played 1 and 4 games, and the No.2 played 2 and 5 games.

The visiting team 1 played two or four games, and the No.2 played 1, five games.