/rb sum show
/rb sum hide
Unknown arguments
and i dont see any other commande to turn off the summary

Edit: line 509 in the .lua, the toggle option is showSum when the description says it should be show

This was mostly a documentation error, correct syntax will be /rb sum showSum. The README was updated.

You can also change this in the options menu without slash commands by the way, just /rb by itself will open the menu.