I use this icon mod and it works fine. There are two things to take into account:
Icon mods are often not compatible with one another. You should run only one. The ACU Highlight UI mod is another icon mod.
Because of how icon mods work internally it may not apply immediately. Without being too technical, the use of the icon mod needs to be written to the preference file. This often happens after you launched the lobby. That means that if you selected the icon mod in the same lobby then it will be available in the next lobby. This can be quite confusing as you try out icon mods. But unfortunately, there's not much that we can do about it.
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