Sequoia 15.3 - what is this arrow?

https://preview.redd.it/zg8z9yikxlie1.png?width=1016&format=png&auto=webp&s=3999a9dc601bd7baa160bd337be7976524ecec4a Can someone please tell me what this arrow is at the top of my screen and more importantly, how do I get rid of it?