Hi robert2811
Loco translate is not a multi-language plugin, it just allows you to translate PO files within theme, plugins, etc. So you should have no problems with it. But if you are using any other multi-lang plugin like Polylang, we can't assure this will work.
Anyway, if you have a way to set up your admin side to English it should work. I can see on your screenshot, at the top bar, that you have a link there that says "Show all languages". Did you try to change it to English instead?
Best Regards,
Salva.