Double tap won’t work to open my screen, it works to shut it off.

Today I opened my open LG 5 screen by double tapping like usual, but 2 horizontal white lines appeared and are now stuck on my screen, even in games. The double tap to open my screen will not work anymore. It does however work to shut it down.
Question is, where in my settings do I find the option to turn double tapping back on??

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