TORONTO—Ontario is postponing March break until the week of April 12 in an effort to reduce COVID-19 spread as students return to in-person classes. Education Minister Stephen Lecce said postponing the break—a decision based on the advice of the province’s chief medical officer—is an important way schools can help limit community transmission. “I recognize this is one more change in a year that has been challenging for so many students and our education staff,” Lecce said Thursday. “But it is one made on the best advice of public health officials to keep them safe and to keep our schools open in this province.” The province’s largest teachers’ union, the association representing public school boards and the Opposition New Democrats had all asked for the March break to go ahead as planned, saying families, students and teachers needed it. All students began the new year learning remotely as part of a …