The tutorial page at https://github.com/Unity-Technologies/com.unity.perception/blob/main/com.unity.perception/Documentation%7E/Tutorial/Phase1.md#step-5 has an image of the HueOffsetRandomizer. I have a project in Unity 2020.3.f1 on Linux (Ubnut 20.04) that is based on the tutorial, but the range controls on randomizers in my project render as two small white lines, rather than a text box.

The problem persists if I remove and re-add the randomizer. I haven't tried deleting and reinstalling com.unity.perception yet.