If you hold down the Command key and, whilst doing so, click on the Menu Bar icon and drag it downwards, it should disappear with a ploof sound.
Naturally, it's your business and I don't wish to intrude, but if you were willing to tell us: why did you want to remove Malwarebytes? It's been highly recommended on these forums for many years, and still is.
And it remains free (the latest version has a 30-day trial period after which it remains free - unless you want the premier version which most of us feel is unnecessary.)
Ian