There are two ways to hold the temperature on a Nest Thermostat: On the thermostat or in the Home App.
On the Thermostat
Select "Hold" shown in the menu view
Select "Current Temp" or "Eco"
Choose a time by scrolling up or down
In the Home App
Select your thermostat on the home screen
Be sure that your thermostat is in Heat, Cool, or Heat • Cool mode before starting a hold
Select "Hold temperature"
Select the "Current temp" or the temperature preset you want your thermostat to hold
Choose the end time you want the temperature to hold until
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