Office Settings & Configuration

Why Word Documents Have Different Sizes in Side-to-Side View and How to Fix It

Bushra Parveen Sep 28, 2026 869 views

Question details

The user is trying to compare two Word documents using the Side-to-Side page movement feature, but they display at different physical sizes despite both being set to 100% zoom, and the zoom controls are disabled.

How to Fix Different Document Sizes in Word Side-to-Side View

Product: Microsoft Word
Device & OS: not provided
Scenario: Viewing and comparing two documents simultaneously using the Side-to-Side page movement feature.
Observed behavior: Documents appear at different physical sizes at the same zoom percentage, and standard zoom controls and sliders are unavailable.

Before you start

Verify the page setup of both documents to confirm if they are using different physical paper sizes (e.g., A4 vs. Letter), as Side-to-Side view scales pages relative to their actual print dimensions.

Solution 1Recommended

Switch to Vertical Page Movement

Reverting back to the standard Vertical view is the most direct way to restore full control over your zoom slider and document magnification.

In Side to Side view, Word simulates reading a printed book. It sizes pages based on their physical print dimensions, meaning documents with different page sizes will inherently look different even at the same percentage. Switching to Vertical movement re-enables your zoom options.

Navigate to the View Tab

Open your Word document and click on the 'View' tab located in the top ribbon.

Change Page Movement

Locate the 'Page Movement' group and click on 'Vertical' instead of 'Side to Side'.

Adjust Document Zoom

Use the zoom slider located at the bottom-right corner of the Word window to manually adjust both documents to your preferred viewing size.

Standard View Restored: Once in Vertical mode, you can still place two document windows next to each other on your screen for comparison while retaining full zooming capabilities.

Solution 2

Maximize Both Document Windows

If you prefer to continue using the Side to Side page movement, maximizing the application windows can help optimize the available display size.

Free Microsoft Office alternative

Compare Documents Seamlessly with WPS Office

If Microsoft Word's restricted zoom controls in Side-to-Side view disrupt your workflow, try WPS Office. It provides a lightweight, highly compatible alternative with flexible side-by-side document viewing and unrestricted zoom controls.

1. Download and Install: Download WPS Office for free from the official website and install it on your computer.
2. Open Both Documents: Launch WPS Writer and open the two documents you wish to compare.
3. Enable View Side by Side: Navigate to the View tab and click 'View Side by Side' to compare them comfortably with full zoom functionality.

Free and lightweight Office suiteFully compatible with Microsoft Word (.docx) formatsFamiliar user interface for easy and seamless migrationAdvanced View Side by Side feature with synchronous scrolling

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Frequently Asked Questions

Why is the zoom slider greyed out in Side-to-Side view?

Side-to-Side page movement is designed to mimic reading a physical book. It forces pages to display at their approximate print dimensions and fits as many pages as possible on the screen, which intentionally disables manual zoom controls.

How do I change the physical page size of my Word document?

Navigate to the Layout (or Page Layout) tab, click on 'Size' in the Page Setup group, and select your preferred paper format (such as A4, Letter, or Legal) so both documents match in dimensions.

Can I still compare documents synchronously in Vertical view?

Yes. You can open two documents, arrange them side by side on your monitor, and use the 'View Side by Side' feature under the View tab. This allows you to scroll through them simultaneously while keeping all zoom controls active.

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