Theme development

I am using Mix n Match theme.
I've got a Custom Mix n Match theme present and i want to not only change colors, blocks, etc, but want to change the whole thing - menu items etc.
Can I use this custom child theme to make change in the structure and NOT have them show up on the main theme that is out in the public?
Thanks, Deb

This may be something I have broken myself, I have been searching all day and nobody seems to have the same problem. On my front page I have 2 links under every teaser, one for "read more" and one for "add new comment" I would be happy with only the "read more" link but when you click it there is no way to comment. This is a 12 year old site and I don't remember ever having this happen on any of my sites. I am using a Zen subtheme.

I have a problem installing the theme which gives me an error like "The website encountered an unexpected error. Please try again later." and the console gives a 500 error

why?

Using Drupal 7.53.

Installing Nexus Theme, get this message:

Error installing / updating
File Transfer failed, reason: Cannot create directory /home/solidarity/www/www/sites/all/themes/nexus.

So, I wanted to set body classes in classy html.html.twig specific for every page. I've got from head_title.title classes.
But when I change language body class changes to another head title value for a 2nd language. My question is how I can have body class from head_title.title value to be set for every language to be the same and not translated ?

I like to move the left hand side further left to remove the white space, as well as move the right hand side towards the right, so that the centre has more space. I like to remove line wrapping with entries and with the majority of my endusers using widescreen monitors it doesn't look that great.

Thanks.

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