monitor refresh rate question

Sep 19, 2018
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I currently have a 24 inch 1080p 144hz monitor. I'm selling this monitor and i've ordered a 32 inch 1440p 75 hz monitor. I want to set my current 144hz to 75hz so that I can get used to the change, however my monitor only displays options for 144, 120, and 60. There's an option under display properties to manually input a refresh rate but warns of possible damage to hardware and is grayed out. I cant imagine under-clocking a 144hz monitor to 75hz would cause any damage. So my question is, is there any way to manually select a refresh rate or to get the manual refresh rate box un-grayed out so that I can use it?