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