How to close Font Categories Panel?

Since the last update, the Font Categories Panel has appeared on the left-hand side and I can’t see a way to turn it off. Does anyone know what the command is, please?

Sometimes people accidentally hide it, so now we ensure that can’t happen.

Thanks Erwin. I don’t use it so now I have an unwanted panel taking up screen space.

For now you can make it as small as it allows you, but it can no longer be closed/hidden.