: Ensure rulers are visible ( Ctrl + R or Cmd + R ) and click-drag from the horizontal or vertical ruler onto the canvas.
If you are using a different application like , you can convert any vector object into a guide by selecting it and choosing View > Guides > Make Guides . To help you further, could you clarify:
: If guides still flicker or disappear, go to Preferences > General and select Reset Preferences on Quit , then restart the app. 3. Locking and Clearing
: Use the Move Tool (V) to drag a guide back into the ruler.
Do you need help with the file for a specific use (like social media or print)?