Toggle Sidebars was a plugin to hide the sidebar panels for the Unreal Engine Editor. It's been removed due to lack of interest on it, even after being offered for free (massive downloads / but no ratings).
Added support to Animation Blueprint editor.
Added support to Material editor.
Added support to Widgets editors.
One single hotkey for all editors.
Added support to Actor Component, Scene Component, and Blueprint Interface.
Better synchronization while working with several blueprints at the same time. Each window has its own current sidebar visibility state.
Possibility to hide the toolbar, it must be activated in the options like any other window.