When mapping data sources, the target tree of vocabulary and lex paths can be large, making it hard to find the right place to drop a source column. Two filters now help narrow it: a filter box above the target tree where you can type to reduce it to matching entries, and an automatic filter that, while you drag a source item, temporarily narrows the target tree to entries related to the words in the dragged item's path. This makes the relevant drop targets much easier to find.