The 600px / 380px breakpoints were @container docpane queries but the email reader isn't inside a docpane container — they never fired and the cluster wrapped to 3+ rows at narrow widths. Added container-type:inline-size + container-name:emailreader on .email-reader-header and switched the queries to that container, so the 2-row cap now actually applies.
1.1 MiB
1.1 MiB