Assuming you are using R2023a version,
The color of wires are dependent on the "sample time" of your model. Different colors may be due to constants, or other blocks having different "sample times".
One can change that by double clicking the said block, and change the sample time to "-1", which is also the default and should match the colors of different wires coming in and out of that block.
Alternately, one can also click on the two arrow lines on the left pane of Simulink view (image attached) to open "Timing Legends" and change the colors of different types of blocks from there.
Alternately, if one wants no colors except the default ones, they can go to "Debug" tab --> "Information Overlays" --> "Colors" and disable colors.
https://in.mathworks.com/help/simulink/ug/how-to-specify-the-sample-time.html -- Documentation to Specifying Sample Time
https://in.mathworks.com/help/simulink/ug/how-to-view-sample-time-information.html -- Documentation to Sample Time Legends
