メールログがadmin-containerに溢れ、水平スクロールが必要

[chapoi]

There has been a recent change indeed

UX: minor improvements to the admin email log layout

So this is the intended design. The alternative is a more squashed look.

Eventually, at a small enough width, the table is going to overflow horizontally and you need scroll. I guess you are reaching that point a bit quicker on your viewport now.