Man pages matching name xmvacreatemanagedrowcolumn in section 3:

XmVaCreateManagedRowColumn.3.en	debian 10 / libmotif-dev
XmVaCreateManagedRowColumn.3.en	debian 11 / libmotif-dev
XmVaCreateManagedRowColumn.3.en	debian 12 / libmotif-dev