Customizing toolbar

I’m using the iFrame, I have been able to modify the css to change tool icon size. What I’d like to do is have more than 4 icons on that toolbar, and hopefully just the ones I need: Audio, Video, More, and HangUp. Room where red indicated:
image

I’m guessing I would have to modify this maxwidth in jitsi-meet\react\features\toolbox\components\native\styles.js

toolboxContainer: {
    flexDirection: 'column',
    flexGrow: 0,
    width: '100%',
    maxWidth: **580,**
    marginLeft: 'auto',
    marginRight: 'auto'
}

@DaveA Can you please share how you were able to change the icon size. I would like to do it for the mobile screens specifically as the icons are too small there.