Sidebar

Some editors have a Sidebar at the right side. It can be resized by dragging. It can be closed and opened.

Opening and closing by menu and hotkey

The view menu provides you with menus to close and to open the Tool shelf.

It also shows the hotkey.

Resize

You can grab the border and drag the Sidebar to the left or to the right to expand or to close it.

Open Sidebar by Plus Button

When a sidebar is closed then you will see a little plus button. When you click at this button then the sidebar will reappear.