Plugin Not Securing Menu Items by User

I installed Ultimate Member because the description made it sound like it could secure menu items (and their direct URLs) by user. But now the plug-in is installed and I can’t find any way to do this. I need particular menu items to be allowed to only specific users.

This is a classroom website. My gradebook is a Google Sheet provided by the school, and each student’s section of the Sheet is “published to web” and embedded in an iframe on the student’s private page. Now I think I need to provide menu items for each student to reach his private page, and I don’t want students to see any other student’s menu item. I also want the direct URL to these menu items to be secured.

All the plugins I’ve found so far depend on roles, or on logged-in status, but not on individual user IDs. I am familiar with php and htaccess but not yet familiar with WP internals.

I had been using the WP-Members plugin to secure our private classroom website, and using the User Specific Content plugin to secure a private page for each student’s grades. (This plugin can also secure posts, but not menu items.)

I was prepared to replace them with Ultimate Member but it doesn’t seem to do anything that WP-Members didn’t already do. User Specific Content’s checkboxes would be great if they were available to menu item editing the way that they are for Page Editing.

Is there a better strategy to accomplish this?
If this strategy is good, is there already a plugin for this?
All suggestions or corrections welcome.
Thank yyou for your attention.

The page I need help with: [log in to see the link]