Hello,
I found this addition in the changelog (version 1.1)
* Added the ability to enable chart exporting using the Highcharts exporting utility.
So far I haven't found an exact discription how to activate this. There is no mentioning how to activate in the Belchertown Charts Documentation.
Adding the option in GRAPHS.CONF(.EXAMPLE):
# Global Chart Defaults
# These are fallback options that charts will use if an option is not defined.
aggregate_type = None
time_length = 90000 # Last 25 hours
type = line
colors = "#7cb5ec, #b2df8a, #f7a35c, #8c6bb1, #dd3497, #e4d354, #268bd2, #f45b5b, #6a3d9a, #33a02c"
tooltip_date_format = "LLL"
exporting = 1
Resulted in this with the "hamburgers" showing up in the upper right corners:

But the "hamburger" buttons can't be selected (inactive).
Maybe someone has already discovered how to configure the right way to export the charts?