I can’t help with 1 and 2, but you can choose the version in the settings – upper right corner, click on the icon with the 3 sliders, then to the right of the word MODE is a barely visible red on black version number that you can click to choose your p5 version.
To the web designers: NEVER use pure red text on a black background. Around 1/12 of men are at least slightly red colorblind and red on black is just not visible to us. That includes especially red error messages in the black Processing IDE console. If you want red, add in some green and blue to make it bright enough to stand out.