I’ve been using UE4 for 2 months now and from the first day I was surprised that I could not hide and show the sidebars at will. Since this does not exist in the market, I decided to create it by myself and share it.
You can hide all UE sidebars with a single mouse click or by a configurable keyboard shortcut. It works on the Main Editor and especially with Blueprint Windows where I am working most of the time.
You can take a look in here