Text in the PDF appears blurry

Sorry, I can’t attach a PDF due to confidential information. Also, this only happens to certain customers of my company. In other words, I can’t reproduce the bug because it’s too difficult to reproduce.
I found a method called setCanvasMultiplier in Core, so what do you think about solving the problem by using that method to increase the resolution when the zoom out button is pressed? Is this the best approach?

Perhaps this bug is caused by a loss of resolution due to the user’s environment. So it would be better if the resolution could be increased.