Great, thank you. I went to Appearance > Editor > Styles > Layout. Turns out that there was some default padding, which I removed.
I can’t seem to find how to change between content and wide width on the theme blocks, so I’ve just changed the content width (which was already set to 42rem) to 80 torem match the wide width.
Edited to add: just found the setting to change. It wasn’t on the block side bar as I expected, but on the pop up menu on the block (if that makes sense!)
Thank you for the suggestions. I’ll definitely consider the plug-in if I get further issues.
I’ve discovered that I had the column block setting set to “stack on mobile”, which is why the logos were changing to a vertical, full width display. Changed it now, and they’re back to staying in the same order and smaller.