i have a little problem with a taskbar

Hello, i have a little problem. In the software “Harmony”, there is a taskbar on the left of the screen. For select the pen, rubber and other (the thing highlighted in green). But i do a mishandling and i removed it, and i don’t know how to put it back. (i don’t speak english a lot, i think, i don’t see the key to put it back)
Thanks for help.

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