ModelProject/Library/PackageCache/com.unity.2d.animation@5.1.1/Editor/Assets/SkinningModule/MeshToolbar.uxml

<?xml version="1.0" encoding="utf-8"?>
<UXML xmlns:ui="UnityEngine.UIElements" xmlns:aui="UnityEditor.U2D.Animation">
  <aui:MeshToolbar name="MeshToolbar">
      <ui:PopupWindow name="PopupWindow" text="Geometry">
          <ui:Button name="GenerateGeometry" tooltip="Wizard to auto generate geometry, associate bones and weight generation">
              <ui:Image name="GenerateGeometryImage" />
              <ui:Label text="Auto Geometry"/>
          </ui:Button>
          <ui:Button name="SelectGeometry" tooltip="Edit a selected Sprite's geometry">
              <ui:Image name="SelectGeometryImage" />
              <ui:Label text="Edit Geometry"/>
          </ui:Button>
          <ui:Button name="CreateVertex" tooltip="Create vertices on the current selected Sprite">
              <ui:Image name="CreateVertexImage" />
              <ui:Label text="Create Vertex"/>
          </ui:Button>
          <ui:Button name="CreateEdge" tooltip="Define geometry edges on the current selected Sprite">
              <ui:Image name="CreateEdgeImage" />
              <ui:Label text="Create Edge"/>
          </ui:Button>
          <ui:Button name="SplitEdge" tooltip="Split an existing edge on the current selected Sprite">
              <ui:Image name="SplitEdgeImage" />
              <ui:Label text="Split Edge"/>
          </ui:Button>
      </ui:PopupWindow>
  </aui:MeshToolbar>
</UXML>