Can you still repro this? Atm I can’t locally.
Horizon uses the full-width component, so if you would use Foundation (full-width) theme, you’d see the same I think.
So while I agree it isn’t the best-looking layout, this is currently expected for all themes that use a full-width layout yes.
Screenshots provided shows it’s different in Horizon and Foundation 
Or am I missing something?
Oh! Need to check that. Didn’t know there was a distinction!
I don’t seem to have installed Foundation full-width, tried searching on meta and didn’t come up?
Its not a specific theme, it’s this component: Discourse Full-width component
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