wp-bootstrap-navwalker VS CMB2

Bootstrap navwalker: https://github.com/wp-bootstrap/wp-bootstrap-navwalker

I am currently trying to implement the Bootstrap Navwalker (see here: https://github.com/wp-bootstrap/wp-bootstrap-navwalker) in my wordpress files with the latest Bootstrap version 5.0.0. However, there seems to be an issue with the Navwalker when using this Bootstrap version. Everything works the way it should on desktop. However, on small screens or mobile, the dropdown doesn't drop down (it that makes sense). I am attaching a picture - basically, if I click on the circled button nothing from the nav comes down and I can't click any sites.

So far in this current project, I added CMB2 as a composer dependency, and that's done just enough to take away the headache of adding custom metaboxes and input fields to different pages. I feel like maybe if I just get myself the most basic toolkit to handle these common tasks, and a boilerplate to start me off with some structure, I may be able to wrap my mind around the way WP expects things to be added and registered the more I work with it.