As far as I can tell there’s no way to change it at the moment. The web interface has no sort option in the file browser, and it shows items in the order the server sends them: folders first, then files, each sorted by raw byte value. That’s why it doesn’t look like dictionary order. All uppercase names come before lowercase ones (e.g. “Zeta” before “apple”), and names with accented letters come after “z”.
The good news is that the server already sends the modification, creation and access times for every file to the browser, so sorting by name or by date could be added entirely in the web interface. The change should be fairly minor from an effort perspective if it’s decided to be added