It’s a binary sensor, not a switch, so you can’t toggle it ON and OFF directly. Home Assistant can’t turn a binary sensor ON or OFF. If you need to control the state manually, consider using a toggle helper instead.
You can have a look at this blueprint. Copy paste the sensor id into the Target Entities To Track then create a toggle helper and add it into Manual Control Status - Toggle Helper. Then use that toggle helper in the manual switch if you need to use that binary_sensor.ensuite_manual_fan_switch
Blacky 