A family of Microsoft products that enable users to capture, organize, and reuse notes electronically.
Create a new blank page and enable Draw > Ruler there; this is the most direct way to recover a ruler whose saved position may be outside the visible canvas without repeating the toggle on the affected page.^1^
Recovery sequence
- In OneNote, select Add Page to create a blank page.
- Select Draw > Ruler.
- If the ruler appears:
- Drag it toward the center of the page.
- With a mouse, place the pointer over it and use the mouse wheel to rotate it.
- On a touchscreen, use one finger to move it and two fingers to rotate it.^2^
- Return to the original page and select Draw > Ruler again.
- If it remains invisible everywhere, close OneNote completely—not just the notebook window—reopen it, create another blank page, and test Draw > Ruler there.
OneNote does not document a keyboard command or dedicated Reset ruler position option. The documented controls require interacting with the visible ruler using a mouse, touchpad, or touchscreen.^2^
If it is still missing
If OneNote has been moved between monitors, temporarily test for a display-rendering problem:
- Move OneNote onto the primary display.
- Go to Windows Settings > System > Display.
- Temporarily use the same scaling value on all displays, such as 100% or 125%.
- Close and reopen OneNote, then test the ruler on a blank page.
OneNote display problems have been reported when moving the application onto an external display, although this is not a documented ruler-position reset.^3^
If other parts of OneNote also flicker, disappear, or render incorrectly, repair Office:
- Open Control Panel > Programs and Features.
- Select Microsoft 365 or Microsoft Office.
- Select Change > Quick Repair.
- If that does not resolve the rendering problem, repeat and choose Online Repair.^4^
Check which OneNote app is installed
In the current Microsoft 365 desktop OneNote, the ruler is part of the Windows Draw experience.^5^
If the title or Start menu specifically says OneNote for Windows 10, its ruler was documented only for touch-enabled devices; one finger moves it, two fingers rotate it, and three fingers rotate it in five-degree increments.^6^
References
- why ruller function in Microsoft One Note did't show up?
- Rotate the Ruler in Word, PowerPoint, and OneNote | Microsoft Support
- OneNote breaks if I move it onto an external display
- OneNote display error - Microsoft Q&A
- Learn more about Drawing Tools | Microsoft Support
- Draw straight lines or measure with the ruler in OneNote for Windows 10 | Microsoft Support