This has been a common issue so we will probably automatize the other debug once "Show HitZones" gets enabled.

In T176362#2518651, @Geez wrote:

Hello Tactical_Toxic.
This is not broken, just requires an additional thing setup to work.

From: https://reforger.armaplatform.com/news/mod-report-2

Show Hitzones Debug
From now on, if you want to use "Show hit zones" debug located in GameCode->Hit Zones you will need to enable the debug of HandleDamageSystem. You can do it from the diag menu like this: Systems-> Systems Diag -> Frame -> Check HandleDamageSystem
Pin

oh, my bad, sorry. But yea it also a bit overcomplicated

@Tactical_Toxic ShowHitZones diag now automatically enables the requirement of DamageSystem frame diag. This change will be included on a future release.