Formatting Issues

How to Remove Extra Fill or Bumps from Word Heading Styles

Elise WilliamsElise Williams Nov 2, 2026 869 views

Question details

The user needs to remove an unwanted visual bump or extra fill that appears on the right side of a Heading 1 style border.

How to Remove Extra Fill or Bumps from a Word Heading Style
Product
Microsoft Word for Mac
Device & OS
Mac
Scenario
Applying or viewing a Heading 1 style with an outline border in a document based on a specific template.
Observed behavior
The heading border renders incorrectly, showing as a solid rectangle with an extra fill or an unwanted bump on the right side instead of a clean, uniform outline.
Before you start

Ensure your document is open in Print Layout view so you can accurately see how borders and styles are rendered on the page.

Solution 1Recommended

Change the Heading Outline to a Box Border

Switching from individual side borders to a unified box border circumvents the rendering bug in Word for Mac.

This visual glitch is often caused by a known rendering issue in specific versions of Word for Mac when outline borders are constructed from separate top, bottom, left, and right border lines.

1
Modify the Heading Style

Navigate to the Home tab. In the Styles gallery, right-click on 'Heading 1' (or the affected style) and select 'Modify' from the context menu.

2
Access Border Settings

In the Modify Style dialog box, click on the 'Format' dropdown menu located at the bottom-left corner and choose 'Border'.

3
Apply Box Setting

Under the 'Setting' column on the left side of the Borders and Shading dialog, select the 'Box' option instead of 'Custom' or individually clicking the border sides.

4
Save to Template

Click 'OK'. Before closing the Modify Style dialog, check the radio button for 'New documents based on this template' if you want this fix to apply to all future documents. Click 'OK' again to apply.

Change the Heading Outline to a Box Border
Style Applied: Applying the box border should immediately force the application to render the heading outline cleanly without the right-sided bump.
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Frequently Asked Questions

Why does my Word heading have a black box around it?

This usually happens due to modified style borders or background shading. Check the 'Borders and Shading' settings within your Heading's Modify Style menu to clear unwanted formatting and set the border to 'None'.

How do I remove a background color or extra fill from a heading in Word?

Go to the Home tab, select the heading text, click the Shading tool (the paint bucket icon) in the Paragraph group, and select 'No Color'.

How can I completely reset a Word style to its default settings?

You can clear the current formatting by selecting the text, opening the Styles pane, and choosing 'Clear All'. Alternatively, click the drop-down arrow next to the modified style in the Styles pane and choose 'Revert to template style' or 'Update to Match Selection'.