Vivaldi havent Setting - Keyboard - Developer Tools
Vivaldi have not Setting - Keyboard - Developer Tools
And all developer shortcuts didnt work
F12 to start Developer Tools can not be changed, so there is no entry in Vivaldi settings page.
And which Developer Tools shortcuts do not work?
@andreysneg I can confirm there are issues with using dev tools shortcuts if the dev tools are not actively focused. Have you filed a bug report yet?