diff --git a/Changelog.md b/Changelog.md
index 303fb9254..0a74cd5e4 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -9,6 +9,7 @@
   - [#765](../../issues/765) - InRibbonGallery Resizing Issues
   - [#766](../../issues/766) - Resizing of InRibbonGallery in a DataTemplate does not work
   - [#768](../../issues/768) - Accessibility Insights: "An onscreen element must not have a null"
+  - [#770](../../issues/770) - Cannot left align the content in InRibbonGallery
 
 - ### Enhancements/Features
   - Many automation peers have been added and improved
diff --git a/Fluent.Ribbon.Showcase/TestContent.xaml b/Fluent.Ribbon.Showcase/TestContent.xaml
index 767aff3f8..81f0e46c4 100644
--- a/Fluent.Ribbon.Showcase/TestContent.xaml
+++ b/Fluent.Ribbon.Showcase/TestContent.xaml
@@ -1194,6 +1194,7 @@ Pellentesque nec dolor sed lacus tristique rutrum sed vitae urna. Sed eu pharetr
                                             MinItemsInRow="2"
                                             ItemWidth="40"
                                             ItemHeight="55"
+                                            Width="300"
                                             MinItemsInDropDownRow="5">
                         <Fluent:InRibbonGallery.Filters>
                             <Fluent:GalleryGroupFilter Title="All"
diff --git a/Fluent.Ribbon/Controls/InRibbonGallery.cs b/Fluent.Ribbon/Controls/InRibbonGallery.cs
index da75286f8..5c91487e2 100644
--- a/Fluent.Ribbon/Controls/InRibbonGallery.cs
+++ b/Fluent.Ribbon/Controls/InRibbonGallery.cs
@@ -1200,8 +1200,9 @@ private void OnDropDownOpened(object sender, EventArgs e)
             {
                 this.galleryPanel.MinItemsInRow = this.MinItemsInDropDownRow;
                 this.galleryPanel.MaxItemsInRow = this.MaxItemsInDropDownRow;
-                this.galleryPanel.UpdateMinAndMaxWidth();
                 this.galleryPanel.IsGrouped = true;
+
+                this.galleryPanel.UpdateMinAndMaxWidth();
             }
 
             this.DropDownOpened?.Invoke(this, e);
diff --git a/Fluent.Ribbon/Themes/Controls/GalleryGroupContainer.xaml b/Fluent.Ribbon/Themes/Controls/GalleryGroupContainer.xaml
index 2ad1211e9..30acfd323 100644
--- a/Fluent.Ribbon/Themes/Controls/GalleryGroupContainer.xaml
+++ b/Fluent.Ribbon/Themes/Controls/GalleryGroupContainer.xaml
@@ -1,4 +1,4 @@
-<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                     xmlns:Fluent="clr-namespace:Fluent">
 
@@ -35,6 +35,8 @@
            TargetType="{x:Type Fluent:GalleryGroupContainer}">
         <Setter Property="Template"
                 Value="{DynamicResource GalleryGroupContainerTemplate}" />
+        <Setter Property="HorizontalAlignment"
+                Value="Stretch" />
         <Setter Property="Focusable"
                 Value="False" />
         <Setter Property="ItemsPanel">
@@ -60,6 +62,11 @@
                     </Setter.Value>
                 </Setter>
             </Trigger>
+            <Trigger Property="IsHeadered"
+                     Value="False">
+                <Setter Property="HorizontalAlignment"
+                        Value="Left" />
+            </Trigger>
         </Style.Triggers>
     </Style>