Over the past week a useless horizontal scrollbar started appearing in the Inbox view. We first noticed it in the macOS app, and now cross-platform in the web app too (see screenshot).
Upon inspecting the styles, it looks like the "cu-inbox-tab__header" elements ("Today", "Yesterday", etc.) are causing a horizontal overflow inside "cu-inbox-tab".
Luckily this can be fixed in various simple ways. One such fix is explicitly setting the width of the inbox tab header: