wolfram cloud – CloudObject when defining functions – how to delete them?

I am an absolute idiot when it comes to Mathematica – I only use it for very simple things (because we use it as a graphing calculator in my high school class), the formatting will be so far from being ideal. My apologies in advance.

Recently, when I tried to define a function with the syntax:

F[x_]: = x ^ 2

and then I type:

? F

The output says:

F[x_]: = x ^ 2

This happens for each function I define. Also, the name of the function usually turns black after it is set, but it does not happen anymore – it just stays blue, which could be related to the whole CloudObject problem? What is CloudObject ?? And more importantly, how can I get rid of it? I just want it to go back to what it was before.