How to disable the weird white circle

[tomáš vydra]

How can I get rid of the weird circle? It appears each time I double-click L-CTRL(Sending image via link because it displays an error each time I try to submit it: https://cdn.discordapp.com/attachme...227a01a7dbc60c59dbaf3eb86c9ba37e0b131d932edb&)

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