I am in no way an expert nor a proficient user of ReFind, but I looked at my own configuration and noticed that in the main configuration, the showtools line is commented out. However, when I looked at the configuration file of the theme I was using, there's a showtools line:
# Minimal dark refind theme v.0.2
# Set the name of a subdirectory in which icons are stored.
icons_dir themes/darkmini/icons
# Your background!
#banner themes/darkmini/bg/ubuntu_two.png
banner themes/darkmini/bg/background.png
# Custom images for the selection background.
selection_big themes/darkmini/selection_big.png
selection_small themes/darkmini/selection_small.png
# Tools
showtools shutdown,reboot,firmware
I suppose then that if you're using a ReFind theme, it might be overriding your base configuration.
Now, this is but an extra, so feel free to ignore this. This is how it looks like (mine has a different background image and list of OS'es):
I suppose you would want a more minimal look like this:
And here's the theme in question, https://github.com/LightAir/darkmini
I hope that helps somehow. Best of luck!
EDIT:
Changed the image to better reflect how my ReFind looks like given the theme and configuration. Added an additional screenshot. Added explanatory text and separation between my main response and additional info.