My three agents have the same radius (32) and the height of 64, 128 and 180.
The 64 sized agents should go under the 80 and higher ceiling.
The 128 and 180 sized agents under 192 and 256
I believe the configuration on the nav mesh is just a default to be used when you don’t specify a particular supported agent on the nav system. So in your case I’d imagine it would not be relevant. The display will only show a navmesh that has ‘Enable Drawing’ checked - did you actually confirm that your smaller agents are unable to move where they should be?
I did create different navmeshes but now how do I specify which of my ai should use which navmesh? There is no “supported agent” option inside the character blueprint