@esy_cari2020, kindly please be informed that this is a bug that has been recorded in the GitHub which you could follow it here:
It should be solved in the next release of the KoBoToolbox. As a temporary fix i have reset the same for you once again (i.e. you should be able to view the graphs again). This time, if you wish to play around with the custom report, kindly please note the followings:
- First change your browser language to English.
- Then you could work with graphs and bars without any issue.
