In case you missed my later edit of my post. You can set the level right in the config file with standard PHP `error_reporting()`. Just tried to be sure and seems to work.
>I think I'm using your fork, but I (stupidly) overwrote themedescription.php when I customised the theme for my site - it has a reference to "... based on zpBootStrap" but not which version. I'm redoing the customisation so will let you know,
Okay, if it is heavily customized sending pull request will of coures become complicated. Our fork does not really use proper version numbers currently being kind of maintenance "on the go", so I can only suggest to try the always latest status via https://github.com/zenphoto/zpBootstrap/archive/refs/heads/master.zip