This is happening to me too. I tested in FireFox, Chrome, and Edge. Same issue on each. Preferences and tools display for a split second after load, then disappear.
I’m not using WPML. I am using Themify Ultra from Themify.Me. When I switch to the stock 2019 theme, tools and preferences appear and allow me to work with them as expected. When I switch Themify Ultra back on, the issue happens again.
Thank you for an amazing plugin!