Does the Shelly Wall Display have a Temperature Hysteresis Feature?

Yes it does!

Temperature hysteresis is the intentional difference between when the thermostat turns the heating and cooling systems in your smart home, such as radiators or air conditioning units, on and off. This prevents the system from constantly turning on and off in response to small temperature fluctuations, which can lead to power waste, increased wear and tear, and a less comfortable ambient temperature in the room. 

For example, with a temperature hysteresis setting of 1°c and a target temperature of 20°c, your heating system will only activate when the temperature in the room reaches 19°c or lower, and won’t activate at 19.5°c.

This feature can be found in the web interface of the Shelly Wall Display; just click on the Thermostat Settings, and navigate to the slider bar labelled Temperature Hysteresis!