The following is for those not familiar with "Custom Zoom."
At the extreme lower right corner of your screen you will see the standard 100%. Directly next to it is a down arrow. Click this. Then click "Custom" at bottom and a box will pop up for your preferences. (Or if you prefer, just go directly to 200% or 400%) Otherwise click/scroll or type in to select preferred size. It's easy and fun. But don't forget to return it back to 100% when you're done. You'll know what I mean the first time you forget and leave it at 400%. This feature is also helpful when a coin is shown with an item for scale. Just keep adjusting the custom zoom until it matches up with whatever size coin is being used. In the case of a quarter, just hold an actual quarter up against your desktop screen until it matches in size. It's fun and easy. Try it. I think you will like it.
Bob