The default ones that I tried to match from Leo's defaults are listed in the readme :
https://github.com/boltex/leointeg/#keybindings
(I guess the welcome/settings webview should have a tab that lists them and accurately shows the ones a user might have overridden.)
For a place to change them to your own liking, use the command-pallette and stard typing "keyboard", the keybaord shortcuts should be the first choice proposed to you. Once in there, you'll see all keybindings and commands which is overwhelming, so type 'leo' in the searchbox to restrict to leoIntegs available commands. See screenshot below (with bonus multi-file support panel under the leo outline that's coming this afternoon on the dev branch to switch from one opened file to the other ...so people can now use leoInteg and copy paste & browse multiple leo file at once, & do actual 'work'):

Have a nice 1st of July My Leonine Friends!
Félix