Since you can't see the Refresh Rate option in your display preferences, I would try booting into Safe Mode first to see if you can reset your display resolution to default settings. If that doesn't work, then I'd reset the NVRAM and SMC (in that order). See below for full steps for each.
Boot into Safe Mode
Follow these steps boot your MBP into Safe Mode:
- Fully shut down your Mac
- Restart your Mac
- Immediately press the Shift key and keep it down
- Let go of the Shift key when you see the login window (NOTE: If you have FileVault enabled you may need to log in twice).
- The very act of starting in Safe Mode will perform a whole heap of functions (such as deleting a whole heap of cache files, verifying your startup disk, etc) so it will take longer to boot.
- After booting into Safe Mode take note of your display preferences (i.e. do you see the Refresh Rate option, etc)
- Exit Safe Mode by rebooting your Mac as normal
- After booting normally take note of your display preferences again
If this resolves the issue, no need to proceed. Otherwise proceed to resetting the NVRAM.
Resetting the NVRAM on Late-2016 MacBook Pro models
Older Macs had what's called Parameter RAM (PRAM), newer Macs use Non-Volatile Random-Access Memory (NVRAM). To reset the NVRAM on all Late-2016 MacBook Pro models (with and without Touch Bar) follow these steps:
- Shut down your machine. Yes, a full shut down, not just logging out.
- Press the power button and then immediately press the commandoptionpr keys.
- Keep these keys pressed down for at least 20 seconds!
- Let go of the keys and let your Mac reboot normally.
Note 1: When you log back in you may need to readjust some of your system preferences (e.g. speaker volume, screen resolution, startup disk selection, time zone information, etc).
Note 2: These steps will also work to reset the NVRAM (or PRAM) for all Macs. However, the late-2016 MBP models actually required the commandoptionpr keys to be held down for 20 seconds, while earlier Macs did not require this, but doing so does not cause any problems either.
If this resolves the issue, no need to proceed. Otherwise proceed to resetting the SMC.
Resetting the SMC
To reset the System Management Controller (SMC) on your model of MBP, follow these steps:
- Shut down your computer
- Keep the power cable plugged in.
- Press at the same time shiftoptioncontrol (on the left side of the built-in keyboard) and the power button (or Touch ID button)
- Let go
- Turn your computer back on with the power button.