@Kimbal Bumstead - The only way I know of to hide the toolbars is to embed your board in “presentation mode”. From there, if someone wants to open the board, they can click on the board title/name. Here’s an example of this:
https://sites.google.com/view/realrobertjohnson/home
Here some more info on embed types in the Embedding Editable Boards into Websites Help Center article → https://help.miro.com/hc/en-us/articles/360016335640-Embedding-Editable-Boards-into-Websites.
And here’s a post about enabling Autoplay on embedded boards → https://community.miro.com/ask-the-community-45/embedautoplay-true-with-frames-4915
Example of no toolbars in website-embedded boards
Miro appears to have written some custom code which hides all toolbars, however, they have also chose not to share this functionality with us, their customers. This can been seen in the Miroverse and also when embedding boards in this forum, e.g.:
Wish List Idea Post
If you’d like to see this option available for all of us, I’d recommend adding this as an Idea in the Wish List category by following the guidelines here: Wish List: Everything You Need to Know.
If you do create a Wish List Idea post, I would also recommend that you post a link to it back here, so that future readers of this post can quickly get to and vote for your Idea.
Lastly, don't forget to vote for your own Idea.