Hi,
In the Insert Field area, you can click on the tab User and select the user meta field. Screenshot https://imgur.com/WuEqL4K
The tab user in the View support getting the meta of logged-in user. If you want to get the user meta from a user, please use the helper function rwmb_meta(). Get more details on this documentation
https://docs.metabox.io/extensions/mb-user-meta/#getting-field-value
https://docs.metabox.io/extensions/mb-views/#running-php-functions
For example
{% set user_image = mb.rwmb_meta( 'user_field_ID', {object_type: 'user'}, 1 ) %}
<img src="{{user_image.url}}" >
.
