void delete() {
		if (program == null) {
			return;
		}

		cancelEdits();

		int[] rows = bookmarkTable.getSelectedRows();
		List<BookmarkRowObject> rowObjects = model.getRowObjects(rows);

		BookmarkRowObjectDeleteCommand cmd = new BookmarkRowObjectDeleteCommand(rowObjects);
		if (rowObjects.size() < 20) {
			tool.execute(cmd, program);
		}
		else {
			tool.executeBackgroundCommand(cmd, program);
		}
	}
Size the columns such that the interesting ones are wider than the uninteresting columns.
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/bookmark/BookmarkProvider.java