It is realy designed to work for a shower. If you are just wanting to turn the fan ON above X% and then OFF below X% you are better to use my 
Temperature Control Exhaust Fan blueprint. You just put your humidity sensor in as the trigger, enter in your fan and then set your rising and falling humidity % you would like.
For this blueprint it has a lot of logic under the hood that not what you are after. The max humidity in this blueprint will only turn it ON not OFF. If you would like to know more about this blueprint have a look at the FAQ. The first 2 FAQ’s guides you through all the settings.
If you are still unsure and you need more help on this blueprint or the other blueprint (other blueprint post questions under its post) then could you please provide us your YAML of the automation? This YAML code are the settings you have selected in the automation so I can help. To do this go into your automation, top right 3 dots, Edit in YAML, copy all the code, come back to the forum and in your reply at the top tool bar click on “</>” and paste code in there.
Blacky 