How to get rid of left vertical bar?

[Antoinette1]

Hello,Could you please explain to me how to get rid of this vertical bar, that camefrom nowhere, I must accidentally mouse about and clicked on somethingto get this one. This is a nonsense that I do not need.There is no way to get rid of it, no option!!!!!!Please help me with this problem to get rid of it.All advise welcomeThank you

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