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

- 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.
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.
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.
Go to the 'Insert' tab, click on 'Table', and select a 1x1 square to insert a single table cell.
Click inside the table cell. Go to the 'Table Design' tab, click the 'Borders' dropdown, and select 'No Border'.
With the cursor still in the cell, click the 'Borders' dropdown again and select 'Bottom Border'.
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 Underlined Nonbreaking Spaces
If you prefer to keep your lines strictly text-based without inserting tables, using underlined nonbreaking spaces will prevent the line from splitting awkwardly.
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. Open a new document in WPS Writer: Launch WPS Office Writer and create a blank document where you want your fillable line.
- 2. Insert a table cell: Navigate to the 'Insert' tab, select 'Table', and insert a 1x1 grid.
- 3. Clear existing borders: Click the table, go to the 'Table Tools' tab, click 'Borders', and choose 'No Border'.
- 4. Add the bottom line: Click 'Borders' once more and select 'Bottom Border' to create a firm, unshifting typing line.

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.




