Formatting Issues

How to Prevent Underlines from Disappearing When Typing in Word for Mac

John WilsonJohn Wilson Nov 2, 2026 869 views

Question details

The user needs a way to keep an underline or fill-in blank line from shifting, breaking, or disappearing when text is typed above it in a Word document.

How to Prevent Underlines from Disappearing When Typing in Word for Mac
Product
Microsoft Word
Device & OS
Mac
Scenario
Creating fillable forms or documents where users need to type text onto pre-existing blank lines without altering the document structure.
Observed behavior
Lines created using underscore characters or tab leaders are being replaced, pushed forward, or deleted as new text is entered.
Before you start

Turn on the 'Show/Hide ¶' formatting marks in the Home tab so you can accurately see spaces, paragraph returns, and hidden table borders while adjusting your document structure.

Solution 1Recommended

Use a Table Cell with a Bottom Border

Creating a single-cell table with only a bottom border is the most reliable method for making a fill-in line that remains perfectly still while text is entered.

When you use standard text characters like underscores to create a line, typing naturally pushes them to the right. A table cell physically separates the text container from the visual line (the border), solving the issue entirely.

1
Insert a one-cell table

Go to the 'Insert' tab, click on 'Table', and select a 1x1 square to insert a single table cell.

2
Remove all existing borders

Click inside the table cell. Go to the 'Table Design' tab, click the 'Borders' dropdown, and select 'No Border'.

3
Apply a bottom border

With the cursor still in the cell, click the 'Borders' dropdown again and select 'Bottom Border'.

4
Adjust and type

Resize the table width to match your desired line length. You can now type freely inside the cell, and the bottom line will remain stationary.

Use a Table Cell with a Bottom Border
Best Practice for Forms: This table method is considered the industry standard for creating robust fillable forms that look professional whether filled out digitally or printed.
Create Fillable Forms Easily

Use WPS Office Writer to Create Stable Fill-in Lines

WPS Office Writer provides powerful and intuitive table design tools, making it incredibly simple to set up forms with permanent, stable underlines that never break when you type.

  1. 1. Open a new document in WPS Writer: Launch WPS Office Writer and create a blank document where you want your fillable line.
  2. 2. Insert a table cell: Navigate to the 'Insert' tab, select 'Table', and insert a 1x1 grid.
  3. 3. Clear existing borders: Click the table, go to the 'Table Tools' tab, click 'Borders', and choose 'No Border'.
  4. 4. Add the bottom line: Click 'Borders' once more and select 'Bottom Border' to create a firm, unshifting typing line.
Fully compatible with Microsoft Word (.docx) formatsIntuitive table and border tools for exact line placementFree, lightweight, and fast alternative to Microsoft OfficeFamiliar user interface requiring zero learning curve
microsoft office alternative - wps office

Frequently Asked Questions

Why do underscores disappear or push forward when I type over them?

Underscores are treated as standard text characters. When you type in the middle of them or next to them, the new text pushes the existing underscores to the right. If you use 'Insert' mode to type over them, they are directly replaced by your new text, making the line vanish.

How do I type a nonbreaking space on a Mac?

In Word for Mac, you can insert a nonbreaking space by holding down the Option, Command, and Spacebar keys simultaneously.

Will a table border show up when I print the document?

Yes, table borders will print exactly as they appear on your screen in Print Layout view. This is why using a single-cell table with a bottom border is the most reliable way to create printable blank lines for forms.

Can I use the Tab key with an underline instead?

Yes, you can enable the Underline format (Command + U) and press Tab to create a line. However, this is heavily dependent on your tab stop settings. If you type text that exceeds the tab stop distance, the line will break or shift unpredictably, which is why the table method is preferred.