See resolutions and supported refresh rate of connected screen
Yes.

For your main display you would:


Click on the Apple menu
Select System Preferences 
Select Displays
Click on Display
Select Scaled to select your resolution 


Notes: 


If you have more than one display, you can select from additional resolution options by also pressing the Option key at Step 5.
You'll also see the refresh rate option after Step 4.


If I've misunderstood your question please let me know.