Buttons "Send message / Log note / Activity" are on two lines instead of one. In addition there is a 1px glitch on the attachment icon. Also long attachment name on tiny screens (i.e. iPhone 5) breaks the composer layout: horizontal scrollbar appears. The two-line buttons effect is related to a change (fix) in Bootstrap 4.2 which removes the white-space: nowrap on .btn. It was originally introduced in Odoo through https://github.com/odoo/odoo/pull/29949. Reference: Original Bootstrap PR https://github.com/twbs/bootstrap/pull/27010 Task ID: 1946573 closes odoo/odoo#31939 Signed-off-by: Adrien Dieudonné (adr) <adr@odoo.com>