How to view monitor refresh rate in macOS? I just purchased a Dell P2175Q monitor for my 15" MBP w/Touchbar. I'm connecting with a USB-C to DisplayPort cable, but when I go to Apple > System Preference > Displays, there is nothing about the Refresh Rate. Pressing the Option key does not show any additional options.

I've seen countless screenshots where this information should appear. Is there another way to check the refresh rate?

I'm on macOS 10.13.4

Thanks.
You need to hold down the option-key while clicking the "Scaled" radio button to bring up the hidden part of the interface.

However, usually this does not give you any information on Refresh rate on this type of monitor as you cannot set it anyways. 

You can click the Apple-logo in the top-left corner of the display, choose "About this Mac" and then "System Report" to bring up the system report. Choose "Graphics/Displays" and you'll have the information on the monitor. In the listing "Resolution" you'll see the refresh rate.