diff --git a/demos/gtk-demo/listbox2.ui b/demos/gtk-demo/listbox2.ui
index 181ee5d4dc..c2c8a1f1cf 100644
--- a/demos/gtk-demo/listbox2.ui
+++ b/demos/gtk-demo/listbox2.ui
@@ -44,15 +44,10 @@
                           <object class="GtkListBoxRow">
                             <child>
                               <object class="GtkBox">
-                                <property name="margin-start">6</property>
-                                <property name="margin-end">6</property>
-                                <property name="margin-top">6</property>
-                                <property name="margin-bottom">6</property>
-                                <property name="spacing">12</property>
-                                <property name="height-request">34</property>
                                 <child>
                                   <object class="GtkLabel" id="switch_label">
                                     <property name="label" translatable="yes">Switch</property>
+                                    <property name="xalign">0</property>
                                     <property name="halign">start</property>
                                     <property name="valign">center</property>
                                     <property name="hexpand">1</property>
@@ -73,15 +68,10 @@
                           <object class="GtkListBoxRow">
                             <child>
                               <object class="GtkBox">
-                                <property name="margin-start">6</property>
-                                <property name="margin-end">6</property>
-                                <property name="margin-top">6</property>
-                                <property name="margin-bottom">6</property>
-                                <property name="spacing">12</property>
-                                <property name="height-request">34</property>
                                 <child>
                                   <object class="GtkLabel" id="check_label">
                                     <property name="label" translatable="yes">Check</property>
+                                    <property name="xalign">0</property>
                                     <property name="halign">start</property>
                                     <property name="valign">center</property>
                                     <property name="hexpand">1</property>
@@ -105,15 +95,10 @@
                           <object class="GtkListBoxRow">
                             <child>
                               <object class="GtkBox">
-                                <property name="margin-start">6</property>
-                                <property name="margin-end">6</property>
-                                <property name="margin-top">6</property>
-                                <property name="margin-bottom">6</property>
-                                <property name="spacing">12</property>
-                                <property name="height-request">34</property>
                                 <child>
                                   <object class="GtkLabel" id="image_label">
                                     <property name="label" translatable="yes">Click here!</property>
+                                    <property name="xalign">0</property>
                                     <property name="halign">start</property>
                                     <property name="valign">center</property>
                                     <property name="hexpand">1</property>
@@ -164,15 +149,10 @@
                             <property name="activatable">0</property>
                             <child>
                               <object class="GtkBox">
-                                <property name="margin-start">6</property>
-                                <property name="margin-end">6</property>
-                                <property name="margin-top">6</property>
-                                <property name="margin-bottom">6</property>
-                                <property name="spacing">12</property>
-                                <property name="height-request">34</property>
                                 <child>
                                   <object class="GtkLabel" id="scale_label">
                                     <property name="label" translatable="yes">Scale</property>
+                                    <property name="xalign">0</property>
                                     <property name="halign">start</property>
                                     <property name="valign">center</property>
                                     <property name="hexpand">1</property>
@@ -204,15 +184,10 @@
                             <property name="activatable">0</property>
                             <child>
                               <object class="GtkBox">
-                                <property name="margin-start">6</property>
-                                <property name="margin-end">6</property>
-                                <property name="margin-top">6</property>
-                                <property name="margin-bottom">6</property>
-                                <property name="spacing">12</property>
-                                <property name="height-request">34</property>
                                 <child>
                                   <object class="GtkLabel" id="spin_label">
                                     <property name="label" translatable="yes">Spinbutton</property>
+                                    <property name="xalign">0</property>
                                     <property name="halign">start</property>
                                     <property name="valign">center</property>
                                     <property name="hexpand">1</property>
@@ -241,15 +216,10 @@
                             <property name="activatable">0</property>
                             <child>
                               <object class="GtkBox">
-                                <property name="margin-start">6</property>
-                                <property name="margin-end">6</property>
-                                <property name="margin-top">6</property>
-                                <property name="margin-bottom">6</property>
-                                <property name="spacing">12</property>
-                                <property name="height-request">34</property>
                                 <child>
                                   <object class="GtkLabel" id="dropdown_label">
                                     <property name="label" translatable="yes">Dropdown</property>
+                                    <property name="xalign">0</property>
                                     <property name="halign">start</property>
                                     <property name="valign">center</property>
                                     <property name="hexpand">1</property>
@@ -281,15 +251,10 @@
                             <property name="activatable">0</property>
                             <child>
                               <object class="GtkBox">
-                                <property name="margin-start">6</property>
-                                <property name="margin-end">6</property>
-                                <property name="margin-top">6</property>
-                                <property name="margin-bottom">6</property>
-                                <property name="spacing">12</property>
-                                <property name="height-request">34</property>
                                 <child>
                                   <object class="GtkLabel" id="entry_label">
                                     <property name="label" translatable="yes">Entry</property>
+                                    <property name="xalign">0</property>
                                     <property name="halign">start</property>
                                     <property name="valign">center</property>
                                     <property name="hexpand">1</property>