Before writing a custom shortcode in PHP, I was wondering if there was a Toolset shortcode, or other mechanism, to display the number of terms for a given taxonomy. Note that I don't want the number of terms associated with a specific post, but a count of all of the terms associated with the taxonomy. I tried using [wpv-post-taxonomy] per this webpage (https://toolset.com/documentation/programmer-reference/views/views-shortcodes/#vf-153472), but I think the shortcode is specific to the current post.
Why do I need this, you might wonder? I'm creating a front-end filter and I want to create a CSS grid with the same number of columns as terms (e,g., 5 columns for 5 terms).
Then - you should try to create a taxonomy view in legacy mode from Views => Add New and select Taxonomy option and select your desired taxonomy.
And with this view's Loop Editor section just after the [wpv-items-found] shortcode you should try to add the shortcode [wpv-found-count] that will return the total number of count for the found terms.