How to Customize the Outlook Message List Columns to Show Sender and Size

Your Outlook message list may not show the information you need at a glance. The default column layout can hide key details like the sender’s name or the size of an email. This article explains how to modify the view to add, remove, and rearrange columns. You will learn to create a custom message list that displays the sender and file size for better email management.

Understanding Outlook Message List Views

The Outlook message list is not a static table. It is a configurable view that pulls data from fields within each email item. The default Compact view prioritizes the subject, received time, and a few icons. The sender name and message size are often omitted to save space. You can change this layout for any folder, like your Inbox or Sent Items. The changes you make apply only to the specific folder you are customizing, unless you choose to apply the view to all folders of the same type.

Before you start, ensure you are in the Mail module. Column customization works for standard email folders. The steps are identical for Outlook as part of Microsoft 365 on Windows 11 and Windows 10. You need no special permissions to modify your personal views. The process involves accessing the view settings and selecting from a list of available fields.

Steps to Add Sender and Size Columns

The primary method uses the View Settings menu. This gives you full control over all available columns and their order.

1. Navigate to the View tab
   Open Outlook and select the Mail module. Click on the folder you want to customize, such as your Inbox. Go to the ribbon and click the View tab.
2. Open View Settings
   In the Current View group on the View tab, click the View Settings button. This opens the Advanced View Settings dialog box.
3. Click the Columns button
   In the Advanced View Settings dialog, click the Columns button. This opens the Show Columns dialog box where you manage all visible fields.
4. Add the From field
   In the Show Columns dialog, look at the list on the left titled Available columns. Scroll down and find From. Select it and click the Add -> button in the middle. The From field will move to the right pane under Show these columns in this order.
5. Add the Size field
   In the same Available columns list, find and select Size. Click Add -> again to move it to the right-hand list.
6. Adjust the column order
   In the Show these columns list on the right, select a column name. Use the Move Up and Move Down buttons on the right side to position the From and Size columns where you want them to appear in the message list.
7. Apply the changes
   Click OK to close the Show Columns dialog. Click OK again to close the Advanced View Settings dialog. Your message list will immediately update to show the new columns.

Using the Right-Click Method for Quick Adds

For faster access to common columns, you can use the column header menu.

1. Right-click a column header
   In your message list, right-click on any existing column name, like Subject or Received.
2. Select Field Chooser
   From the context menu that appears, click Field Chooser. A small dialog box with a list of frequently used fields will appear.
3. Drag and drop fields
   In the Field Chooser, find and click on From. While holding the mouse button down, drag the field to the column header area in your message list and drop it where you want the new column. Repeat for the Size field.
4. Close the Field Chooser
   Click the X in the top-right corner of the Field Chooser dialog to close it. The columns will remain in your view.

Common Mistakes and View Limitations

Columns Disappear After Switching Folders

Outlook applies view customizations per folder. If you add columns to your Inbox and they are not visible in your Sent Items folder, this is expected. To apply the same view to another folder, customize that folder separately. Alternatively, you can create a new view definition from the View tab. Use Manage Views > New, set up your columns, and apply it to other folders.

Size Column Shows Zero for All Items

The Size column may display zero or a very small number for emails without large attachments. This is normal for plain text messages. The column shows the total size of the email item, including attachments, in kilobytes. If it consistently shows zero for emails you know have attachments, try switching the folder view temporarily. Go to View > Change View > Compact, then back to Single or another view to refresh the data.

Cannot Find a Specific Field in the Columns List

The default list in the Show Columns dialog shows frequently used fields. If you cannot find a more specific field like Sender Email Address, change the dropdown menu at the top of the Available columns list. Select All Mail fields or All Document fields to see the complete list. You can then add more precise columns for sender details.

Default View vs Custom View: Key Differences

Item	Default View (Compact)	Custom View with Sender/Size
Visible Information	Subject, received time, importance, flags, attachments	Includes From and Size columns plus default data
Information Density	Higher, uses icons and compact text	Lower, requires more horizontal space for extra columns
Folder Scope	Applied automatically to all mail folders	Applied only to the folder where it was created unless saved as a new view
Setup Effort	None, ready to use	Requires manual configuration via View Settings
Best For	Quick scanning of subject lines and recent activity	Managing large volumes of mail, identifying senders, and monitoring mailbox size

You can now tailor your Outlook message list to show the exact email details you use most. Adding the sender and size columns helps you sort and identify messages faster. For another useful adjustment, try adding the Categories or Follow-up Flag column from the Field Chooser. To save your custom layout permanently, create a new view from the Manage Views option on the View tab.