#与选中内容匹配的内容背景色
Editor -> Color Scheme -> General -> Code -> Identifier under caret

#选中内容前景色
Editor -> Color Scheme -> General -> Editor -> Selection foreground

#选中内容背景色
Editor -> Color Scheme -> General -> Editor -> Selection background

效果图

参考:
https://blog.csdn.net/Lily_Song_8989/article/details/53199906
https://blog.csdn.net/weixin_34297704/article/details/86119574