Smart Thermostats and V3+ app

I use Manual Control to operate my 3 room radiator stats, I have a wireless room smart thermostat but i don`t understand and never turn it on in the app. Is this normal because my radiators work fine with room stat set off. My biggest gripe is if there is any chance to downgrade to the original older app, I was automatically updated to the V3+ app, it does not show where the heat to each room is going when boiler fires up..The older version had this in room display.

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