@Yamato1169,
As you can see, the Incapacitation setting is in the Medical section of the menu. Setting that to OFF, only applies to Settlers who are Incapacitated due to having a Disease. Settlers can become Incapacitated due to other situations, like: falling, getting downed during an attack, standing in radiated water, etc.
The plot should reset to normal operation once the Settler has recovered. You can refresh the plot using the ASAM Sensor, or pick it up and drop it in build mode to try to poke it to reset.