If you unzip the XUI Views.b4xlib and use this class: B4XSearchTemplate.bas by changing its name perhaps to : MyB4XSearchTemplate and use it in your project so it does not conflict with the built in B4XSearchTemplate.bas, you can then edit one line in the class as follows:
Change this line:
B4X:
Public TextHighlightColor As Int = 0xFFFD5C5C
to this line:
B4X:
Public TextHighlightColor As Int = xui.Color_Cyan 'highlighted color is cyan or any other color