On the Tesla App, allow warming the batteries when charging power is present and the battery temperature is lower than the threshold for full regen.
This might be a safety feature because on icy roads without regen it’s a sudden change of driving behavior. On very cold days (-5°C) it can take up to 50 km of driving until regen is 100% available if you have charged outside a garage before. And braking energy is lost in winter.
Tesla solved this with the Precondioning feature and the ability to set a scheduled departure time to warm the battery.