R语言semplot绘图变量拥挤：indicator_spread参数报错求助

我是semplot新手，当前生成的SEM路径图第一行变量过于拥挤，想了解indicator_spread参数的功能，尝试用以下代码调整：

p <- semPaths(model_out, whatLabels="est",
            sizeMan = 5,
            node.width = 1,
            edge.label.cex = .75,
            style = "ram", rotation =2, 
            indicator_spread = 3,
            mar = c(5, 5, 5, 5))

运行后R报错提示：

In qgraph::qgraph(Edgelist, labels = nLab, bidirectional = Bidir, :
The following arguments are not documented and likely not arguments of qgraph and
thus ignored: indicator_spread

请问如何在不造成杂乱的前提下拉开变量间距？我计划调整节点大小以添加合适标签，但不确定是否有效，求建议！

内容的提问来源于stack exchange，提问作者Shawn B