Have you ever lose your command manager toolbar or you Features Manager Tree like the image below? Fear not.
This might happen because you “miss click” some keys in your keyboard.
Some of these shortcut keys might be helpful :
F9: Open/Minimize your Feature Manager Tree
F10: Open/Close your Toolbar
Ctrl+F1: Open/Close Taskpane
Or you can also access this by right clicking on Menu Bar and Toolbar Menu to toggle it on.
If the Command Manager / Toolbar is not back as expected, you can right click again and click the Command Manager. This happens because the Command Manager is hidden / closed before the Toolbar itself.