5.B.3. In a match with two out of three games to 11 points, in game three, the teams will switch ends in each game when the first player/team reaches a score of 6 and every multiple of 6 points thereafter.  Serve remains with the player holding serve.

(Alternatively, is this potential change:  5.B.3  In a match with two out of three games to 11 points, in game three, the teams will switch ends when the first player/team reaches a score of 6 and every multiple of 6 points thereafter.  Serve remains with the player holding serve.

5.B.4. In a game to 15 points, the teams will switch ends when the first player/team reaches a score of 8 and every multiple of 8 points thereafter. Serve remains with the player holding serve.

5.B.5. In a game to 21 points, the teams will switch ends when the first player/team reaches a score of 11 and every multiple of 11 points thereafter. Serve remains with the player holding serve.

5.B.3. In a match with two out of three games to 11
points, in game three, the teams will switch ends
when the first team reaches a score of 6. Serve
remains with the player holding serve.
5.B.4. In a game to 15 points, the teams will switch ends
when the first team reaches a score of 8. Serve
remains with the player holding serve.
5.B.5. In a game to 21 points, the teams will switch ends
when the first team reaches a score of 11. Serve
remains with the player holding serve.

To minimize/equalize the environmental conditions (wind, sun) that may be present in a tournament venue. It also equalizes the effect of different backdrops that might make the ball more difficult to 'pick up' or see on one end of the court than the other.