Issue #3214170 by Sakthivel M, manojithape, mitthukumawat, tushar_sachdeva: Claro:The cancel button is not center-aligned in the layout builder

(cherry picked from commit f4ff1b59)

Issue #3023311 by bnjmnm, huzooka, kostyashupenko, boulaffasae, nod_, mrinalini9, codersukanta, lauriii, fhaeberle, ckrina, Peter Majmesku, andrewmacpherson, saschaeggi, antonellasevero, DyanneNova, thekishanraval: Modal dialog style update