Although there is a button on the sidebar that allows you to view the controls, however, you cannot rebind keyboard controls, to my knowledge. Does anyone know how to do this?

In immediate mode type:
KEYCONFIG

@dw817 I don't have a copy of Pico-8. I just play games via the BBS.

Then you're fresh outta luck and you won't be able to change the controls ...

However once you are playing a cart in the BBS though, you can click:

seen to the bottom right of the cart to show what your keyboard is configured to.

You really should purchase Pico-8. As you are a gamer there is a special menu just for dedicated players such as yourself called SPLORE.

In it you can see every single game that was ever made with Pico-8 sorted by date and popularity and the useful ability to search for more games too.

And of course you can configured the keyboard to your liking.

$15 being a small price to pay to have access to a database featuring literally hundreds of unique games rarely seen anywhere else - and includes the ability to learn and write your own video games besides.