diff --git a/src/textual/app.py b/src/textual/app.py
index 3142973e6..63c6cfa7c 100644
--- a/src/textual/app.py
+++ b/src/textual/app.py
@@ -494,18 +494,6 @@ class App(Generic[ReturnType], DOMNode):
 
         return DOMQuery(self.screen, selector)
 
-    def query_one(self, selector: str) -> DOMNode | None:
-        """Retrieves a single node via a DOM query in the current screen.
-
-        Args:
-            selector (str): A CSS selector .
-
-        Returns:
-            DOMNode | None: The first node matching the query, or None if no node matches the selector.
-        """
-        result = self.query(selector)
-        return result.first() if len(result) else None
-
     def get_child(self, id: str) -> DOMNode:
         """Shorthand for self.screen.get_child(id: str)
         Returns the first child (immediate descendent) of this DOMNode
@@ -516,6 +504,9 @@ class App(Generic[ReturnType], DOMNode):
 
         Returns:
             DOMNode: The first child of this node with the specified ID.
+
+        Raises:
+            NoMatchingNodesError: if no children could be found for this ID
         """
         return self.screen.get_child(id)
 
diff --git a/src/textual/dom.py b/src/textual/dom.py
index 86e0c3eb1..23b51dbaa 100644
--- a/src/textual/dom.py
+++ b/src/textual/dom.py
@@ -397,6 +397,9 @@ class DOMNode(MessagePump):
 
         Returns:
             DOMNode: The first child of this node with the ID.
+
+        Raises:
+            NoMatchingNodesError: if no children could be found for this ID
         """
         for child in self.children:
             if child.id == id:
diff --git a/src/textual/widget.py b/src/textual/widget.py
index d46485df6..e46d9bb76 100644
--- a/src/textual/widget.py
+++ b/src/textual/widget.py
@@ -403,7 +403,6 @@ class Widget(DOMNode):
         Returns:
             Region: The widget region minus scrollbars.
         """
-        # return region
         show_vertical_scrollbar, show_horizontal_scrollbar = self.scrollbars_enabled
         if show_horizontal_scrollbar and show_vertical_scrollbar:
             (region, _, _, _) = region.split(-1, -1)
diff --git a/tests/test_integration_layout.py b/tests/test_integration_layout.py
index 16105f963..141bb0f38 100644
--- a/tests/test_integration_layout.py
+++ b/tests/test_integration_layout.py
@@ -1,6 +1,5 @@
 from __future__ import annotations
 import asyncio
-import platform
 from typing import cast, List
 
 import pytest
@@ -11,9 +10,6 @@ from textual.geometry import Size
 from textual.widget import Widget
 from textual.widgets import Placeholder
 
-PLATFORM = platform.system()
-WINDOWS = PLATFORM == "Windows"
-
 # Let's allow ourselves some abbreviated names for those tests,
 # in order to make the test cases a bit easier to read :-)
 SCREEN_W = 100  # width of our Screens
@@ -153,22 +149,11 @@ async def test_composition_of_vertical_container_with_children(
 
     expected_screen_size = Size(*screen_size)
 
-    # On Windows the screen size is always 1 cell smaller than the requested dimensions.
-    # Let's take this into account into our "expected_*" measurements:
-    if WINDOWS:
-        expected_screen_size = expected_screen_size._replace(
-            width=expected_screen_size.width - 1
-        )
-        expected_placeholders_size = (
-            expected_placeholders_size[0] - 1,
-            expected_placeholders_size[1],
-        )
-
     async with app.in_running_state():
         app.log_tree()
 
         # root widget checks:
-        root_widget = cast(Widget, app.query_one("#root"))
+        root_widget = cast(Widget, app.get_child("root"))
         assert root_widget.size == expected_screen_size
         root_widget_region = app.screen.get_widget_region(root_widget)
         assert root_widget_region == (
diff --git a/tests/utilities/test_app.py b/tests/utilities/test_app.py
index a17c435fc..9bfb8d5d6 100644
--- a/tests/utilities/test_app.py
+++ b/tests/utilities/test_app.py
@@ -111,6 +111,7 @@ class ConsoleTest(Console):
             width=width,
             height=height,
             force_terminal=True,
+            legacy_windows=False,
         )