我想控制Rstudio中tmap-feature弹出窗口的宽度，我该怎么做？
当我打开使用tmap制作的已保存的html映射时，无法一目了然地查看所有文本。弹出框太小，我必须使用滚动条。
TREND <- tm_shape(AUST_STE_POP) +
tm_layout(title = "Trends of Australian Population growth, 2013-2015", title.position = c("center", "top")) +
tm_polygons(id = "STE_NAME11", c("Population (2013)" = "2013", "Population (2014)"= "2014", "Population (2015)" = "2015"), style=c("pretty","pretty", "pretty"), palette=list("Purples", "Greens", "Blues"), title=c("2013 population", "2014 population", "2015 population")) +
tm_facets(as.layers = TRUE) + tm_view(alpha = 1, basemaps = "Esri.WorldTopoMap")
tmap_save(TREND, "TREND.html")