Let me help you remove it permanently. I'm also not able to minimize that but Yes, I can hide it completely.
Log into Terminal and do following things.
nano customer_dashboard.py and you will get something like this. At the top of page:
Do a small change, just change "True" to value "False"
and Yes, Don't forget to hit bench commands. Hit one by one.
bench setup redis
sudo supervisorctl restart all
and yes, follow the same where you find this heatmap.