IOS – What apps allow me to draw on an iPad and sync it with a Mac

It might be that the fonts aren't being embedded into the PDF, that would cause them to not render correctly on a computer that did not have the fonts installed and Adobe Reader may be faking the look of fonts that it doesn't have. Open the PDF in Acrobat on your PC and in the "File" menu select "Properties..." and then click on the "Fonts" tab. Each font listed should have a remark like "Embedded" or "Embedded Subset".

If that is the case, you may have to change your PDF creation settings (not sure how you are creating the PDFs, so I'm no help there) to make sure that all fonts are embedded.

(Since the accepted answer for this question is outdated and the actual answer is buried as a comment, I’m providing a better answer for all future people with this question, in hopes that it will become more visible.)

The default behavior for the Do Not Disturb feature is stopping notifications while the screen is locked, so that your iPad/iPhone won’t keep buzzing in your pocket/backpack/desk while you’re trying to concentrate on something else.

That’s good, but not what we want. We want to stop notifications while we’re using the device.

Well, at least since iOS 12 there’s an additional setting within Settings > Do Not Disturb that you can turn on, here:

All you need to do is change the “Silence” option to “Always” in this screen. It will keep any and all notifications away from your screen as you write, read, present content to others, play a game, etc.