Issue Checker question

Hi. Hope youre well. I hav ebene struggling to find the issue checker to check my prototype for errors. Any help in terms of where I can go?

if you dont have that it means that you do not have issues

(make sure you also don’t have issues checker turned off - look at the url and look for “&issues_off=true” if you have that it means its turned off. Just deleted that part of the url)