How to change port font color in Matlab Function Block in Simulink

So I'm working on a group development project and I just received a Simulink file that looks like someone ran an information overlay on the rate transitions. This is great, but gets a little hard on the eyes after a while, so I'm trying to revert back to standard black. However, no overlay is active, and when I toggle the overlay the colors don't revert back to black. I've managed to convert all almost everything back manually, but I am having trouble with converting the colors on MatLab Function blocks. I've attached an example below. Does anyone know how to get the I/O text back to just being black?

Answer 1

[Fangjun Jiang]

It looks like block mask. Select the block, press Ctrl+M, check the "icon drawing commands".