Tell your engineer, the same way you'd tell a person: "the photos look squished on my phone" or "the contact form isn't sending." It will look at the live site (including at phone size), find the cause, fix it, and reply with what it changed. That's not a workaround — it is the support model, and it's on duty around the clock.
If the Flight Deck itself won't load, or the engineer's fix doesn't stick, that's our department: hello@onesmallprompt.com, and include your site address. A human reads every one of these.