Remove "Insert Sidebar ShortCode" ICON in text editor

Could someone please tell me how to remove the small icon that the “Widgetize Pages Light” plugin creates in the text editor? When you hover over the icon it says “Insert Sidebar ShortCode”.

I have disabled several posting features using the “IM8 Box Hide” plugin for users who have “contributor” roles, including the OTG Grid Manager Light widget box at the bottom of the text box. However, for some reason that tiny icon in the text editor still appears and still gives contributors the capability of adding sidebars — and I want to restrict them from doing this.

Is there a way to remove the icon with some simple code or via another method?

https://wordpress.org/plugins/widgetize-pages-light/