modular-avatar/Editor/Inspector/Parameters/ParametersMainUI.uxml

<?xml version="1.0" encoding="utf-8"?>
<UXML 
        xmlns:ui="UnityEngine.UIElements"
        xmlns:editor="UnityEditor.UIElements" 
        xmlns:ma="nadena.dev.modular_avatar.core.editor"
>
    <ui:VisualElement name="ListViewContainer">
        <ui:ListView virtualization-method="DynamicHeight"
            reorder-mode="Animated" 
            reorderable="true"
            show-add-remove-footer="true"
            show-border="true"
            show-foldout-header="false"
            name="Parameters"
            binding-path="parameters" 
            style="flex-grow: 1;"
        />
    </ui:VisualElement>
    
    <ui:Foldout text="merge_parameter.ui.unregistered_foldout" name="UnregisteredFoldout" value="false" class="ndmf-tr">
        <!-- The show-add-remove-footer property here somehow also controls the background color
             of the ListView UI (???). As such, we turn it on here, to get the right theme background color,
             but then hide the actual footer in USS.
          -->
        <ui:ListView
            reorderable="false"
            show-add-remove-footer="true"
            show-border="true"
            show-foldout-header="false"
            name="UnregisteredParameters"
            style="flex-grow: 1;"
            />
    </ui:Foldout>
    
    <editor:ObjectField name="p_import" label="merge_parameter.ui.importFromAsset" class="ndmf-tr"/>
    
    <ma:LanguageSwitcherElement/>
</UXML>