在2个箭头中间显示当前显示的是第几个层级的符号

[chenbimo]

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[Gerrnperl]

Views can expose View Actions on the View Toolbar. Be careful not to add too many actions to avoid noise and confusion.

这个地方（View Toolbar）是放置View Action的, 因此不适合放置层级信息。可以考虑在Webview视图内显示