The old Control Panel applets are becoming obsolete these days while Microsoft moving those to the modern Windows 10 Settings app. Microsoft released a new Windows 10 build to the insiders where they are testing a new feature that will allow you to change the Screen Refresh Rate directly from the Display settings page.
The latest Windows 10 build 20236 in the Dev Channel also includes some improvements to the Start Menu search, adds many fixes and improvements. If you are on the Dev Channel, you may like to upgrade to this build to experience the new changes coming to Windows 10.