diff --git a/src/calibre/gui2/convert/structure_detection.ui b/src/calibre/gui2/convert/structure_detection.ui
index 2e97c0d3ca..eb2892a07a 100644
--- a/src/calibre/gui2/convert/structure_detection.ui
+++ b/src/calibre/gui2/convert/structure_detection.ui
@@ -58,7 +58,7 @@
    <item row="9" column="0" colspan="2">
     <widget class="XPathEdit" name="opt_page_breaks_before" native="true"/>
    </item>
-   <item row="10" column="0">
+   <item row="10" column="0" colspan="2">
     <spacer name="verticalSpacer">
      <property name="orientation">
       <enum>Qt::Vertical</enum>
diff --git a/src/calibre/gui2/convert/xexp_edit.ui b/src/calibre/gui2/convert/xexp_edit.ui
index f98eb8b1b8..f3427bce23 100644
--- a/src/calibre/gui2/convert/xexp_edit.ui
+++ b/src/calibre/gui2/convert/xexp_edit.ui
@@ -43,12 +43,6 @@
          <height>0</height>
         </size>
        </property>
-       <property name="maximumSize">
-        <size>
-         <width>500</width>
-         <height>16777215</height>
-        </size>
-       </property>
        <property name="minimumContentsLength">
         <number>30</number>
        </property>