I created a script to disable the create project button for other users. Only firstname.lastname@example.org can create new projects.
You can find the script here: https://tiledeskcustomscript.nicolan74.repl.co/script.js
I configured the tiledesk dashboard component (my-tiledesk-dashboard) to load the script using REMOTE_JS_SRC dashboard environment parameter.
Please host the script.js file to your web server (repl.it has poor performance) and change the REMOTE_JS_SRC env.