You will no longer see health bars and names of other players. Can also works on mobs, there is a config for that.
[Mobs]
## If mob is more than this distance from player, its health bar will be hidden. Set to 0 to hide health bar completely
# Setting type: Int32
# Default value: 6
Mobs healthBar distance = 0
## If mob is more than this distance from player, its name will be hidden. Set to 0 to hide name completely
# Setting type: Int32
# Default value: 2
Mobs name distance = 0
## If mob is more than this distance from player, its alert sign will be hidden. Set to 0 to hide alert sign completely
# Setting type: Int32
# Default value: 5
Mobs alert sign distance = 0
## If mob is more than this distance from player, its stars will be hidden. Set to 0 to hide stars completely
# Setting type: Int32
# Default value: 5
Mobs stars distance = 10
## If mob is more than this distance from player, its aware sign will be hidden. Set to 0 to hide aware sign completely
# Setting type: Int32
# Default value: 5
Mobs aware sign distance = 0
[Other]
## This overrides vanilla hud max show distance. Set to 0 to disable and keep vanilla value. Vanilla value is 30.
# Setting type: Int32
# Default value: 0
Any hud max show distance. Warning: Read description = 0
[Players]
## If player is more than this distance from player, his/her health bar will be hidden. Set to 0 to hide health bar completely
# Setting type: Int32
# Default value: 6
Players healthBar distance = 0
## If player is more than this distance from player, his/her name will be hidden. Set to 0 to hide name completely
# Setting type: Int32
# Default value: 2
Players name distance = 150
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