Navigation gestures when swiping from the left of the screen

[Mtm1401]

When swiping from the left hand side of my screen, I get this arrow (see video) which either takes me home or to recent apps.

I assume it's some sort of gesture navigation but no idea what's causing it or why it's there 🤔

Anyone seen this before and able to advise? 

Thanks 

[Neo001]

Hi, It seems that you have enabled One hand operation + in GoodLock.

 

[Mtm1401]

So obvious, I was even going through the apps in there and somehow didn't think about this 🤦‍♂️
Thanks