@Archetype-Luna One way to toggle height could use the current "non loaded" character asset the game already has, which displays a character as a grey scaled default human/cast shape. In my view, a toggle could use this place holder character in case others don't want to see other people's characters depending on a certain criteria (muted characters could also be shown as this).
Toggles can be made for different motives. For example, the current max displayed character slider allows people to limit how many fully rendered characters exist in their screen. This is made for low end PCs in mind. Making a toggle for other purposes would allow people to not just limit this number, but to target specific groups or even specific players, like characters sized below x height or as mentioned above, characters who have been blocked. As height goes we could use the current limit imposed by the global character creator slider, meaning people won't get to choose a specific height to block, thus simplifying the coding process as it's a catch all solution.
Now I admit I'm not a coder myself so I wouldn't know how easy or difficult would be to add a number of lines of code to address this. Still, using the already imposed height instead of allowing people to choose, and using already in-game assets to fulfill it, would make coding it simpler, I believe.