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The Media Browser dialog uses the Thumbnails view by default. This may be inconvenient in some cases.

There are two ways of dealing with this problem:

• Editing the MediaListviewItem control.
   
• Editing the Image browser control.

1.  Editing the MediaListviewItem control

MediaListviewItem control has the following location:

\sitecore\shell\Applications\Media\MediaShop\MediaListviewItem.xml.

In this control you can modify the width and height attributes of the thumbnails as well as other layout settings.

Below is an example of the modified control source.

<?xml version="1.0" encoding="utf-8" ?> 
<control xmlns:def="Definition" xmlns="http://schemas.sitecore.net/Visual-Studio-Intellisense">
  <MediaListviewItem>
    <Border ID="$ControlID" Class="scListviewItemThumbnails" Width="150" Height="60" ToolTip="$Header">
      <GridPanel Columns="2" Width="100%">
      
        <Border GridPanel.VAlign="top" GridPanel.Width="25%">
          <ThemedImage Src="$Image" Width="50" Height="50" Margin="3 3 3 3" ToolTip="$Header"/>
        </Border>

        <Border Foreground="#999999" Padding="3 3 3 3" Align="left" GridPanel.Width="75%">
          <Border Foreground="black" Style="font-weight:bold">
            <Literal Text="$Header"/>
          </Border>
        </Border>

       </GridPanel>
    </Border>
  </MediaListviewItem>
</control>

As a result, the thumbnail size is decreased.