How to disable the default shortcuts made by BTT, e.g. command+1, command+2, etc.?

Dear Andreas and all BTT user,
I have achieved to set 'command+4' to copy a screenshot into clipboard (the Mac default shortcut is 'control+shift+command+4' with BTT 3.510 before. But now I could not accomplish this anymore, because BTT has set set 'command+1', 'command+2', ...'command+9' as shortcuts in UI, do you guys know where I can disable these default shortcuts for BTT?
Thanks in advance!