How do I disable this overlay it has been there for some time I don't know how to disable it

[Mika 1an2am]

Hi,since few I have been having trouble with a in game overlay which covers top of my screen and I don't know how to disable it I have tried deleting various apps which I thought would have caused but nothing has changed and I have been trying to find for this for few days but I couldn't find anything help me .thank you

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