the problem, I'm on MacBook Pro, I don't have F12
Well there are other ways to open it ofc. For mac it seems to work with Cmd+Opt+J (or in the menu, more tools > developer tools) But resizing the window will also sort of work I´d say.
thank you for your precision
And on Mac, you can use "fn" key plus "sound up" (F12) to have effectively F12. Or if you have a strip bar, you can have functions key in System Preferences > Keyboard > Use functions key…
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thank you for your information