I was running into a similar issue trying to update the Enclaved Dwarven UI. So if I just remove
<PanelFile ID="toolbar">
<!--Edit Y value of the following line if the elements appear to be in wrong place-->
<Element ID="ToolbarField" X="0" Y="2000" Width="1680" Height="210" Detach="1">
<Element ID="ToolbarFieldMain" X="0" Y="0" Width="1680" Height="210" />
<Element ID="LevelMeter" X="0" Y="203" Width="1680" Height="8">
<Element ID="LevelMeterFill" X="0" Y="1" Width="1680" Height="6">
<Element ID="LevelMeter_BonusMeter" X="0" Y="0" Width="1680" Height="6" />
</Element>
<Element ID="LevelMeterText" X="0" Y="0" Width="1680" Height="1" />
</Element>
<!--Replace Width/Height values if you want to change the visibility of the AutoAttack Button. Visible=W120,H160 Hidden=1 -->
<Element ID="AutoAttackIndicatorButton" X="473" Y="66" Width="158" Height="139" />
<Element ID="ViolentModeIndicator" X="540" Y="50" Width="1" Height="1" />
<Element ID="ToolbarButton_AutoAttack_TutorialHighlight" X="540" Y="50" Width="120" Height="160" />
<!--Replace Width/Height values if you want to change the visibility of the Fervour Meters. Visible=W165,H4 Hidden=1 -->
<Element ID="GamePlay_FervorPipDisplay" X="882" Y="45" Width="165" Height="4" />
<Element ID="GamePlay_AimPipDisplay" X="882" Y="45" Width="165" Height="4" />
<!--Replace Width/Height values if you want to change the visibility of the Main Buttons. Visible=30 Hidden=1 -->
<Element ID="ToolBarButton_Quest" X="1385" Y="31" Width="30" Height="30" />
<Element ID="ToolbarButton_Crafting" X="1351" Y="31" Width="30" Height="30" />
<Element ID="ToolbarButton_Social" X="1317" Y="31" Width="30" Height="30" />
<Element ID="ToolbarButton_Journal" X="1283" Y="31" Width="30" Height="30" />
<Element ID="ToolbarButton_Accomplishment" X="1249" Y="31" Width="30" Height="30" />
<Element ID="ToolBarButton_MainMenu" X="1215" Y="31" Width="30" Height="30" />
<!--Replace Width/Height values if you want to change the visibility of the Bag Buttons. Visible=W30,H35 Hidden=1 -->
<Element ID="ToolbarButton_Inventory" X="1620" Y="31" Width="30" Height="30" />
<Element ID="ToolBarButton_Inventory2" X="1583" Y="31" Width="30" Height="30" />
<Element ID="ToolBarButton_Inventory3" X="1546" Y="31" Width="30" Height="30" />
<Element ID="ToolBarButton_Inventory4" X="1509" Y="31" Width="30" Height="30" />
<Element ID="ToolBarButton_Inventory5" X="1472" Y="31" Width="30" Height="30" />
<!--Replace Width/Height values if you want to change the visibility of the Main Quick Bar. Visible=W450,H35 Hidden=1 -->
<Element ID="Toolbar_Quickslot" X="630" Y="165" Width="420" Height="35" />
</Element>
From the skindefinition file and then add my desired image to ArtAssetID="letterbox_bottom" tag, then the UI should use the default placement? Sorry if I just repeated the question you answered. lol
Thanks in advance!
~~Thay