go to document property > security > untick add sheet.
also go to sheet property > security > untick option whichever you don't required.
I just did what Prashant suggested and I dont see that Add Sheet Icon when in webview. Check this attached.
Come out of WebView and then from Doc Properties Untick.
Can you show screen shot of your document property??
Hope you untick admin override security also your login id having only USER access.
Also you have published updated file on access point.