Does it work in the login screen?

Have you followed the instructions that can be found in the official support pages to install Plasma? Installing a different DE in Pop (or any other distro that comes with a DE preinstalled) isn’t so simple. You may want to test if the problem persists if you login with a brand new user, if not then it means that something in ~/.config is probably broken.

Of course that’s why they had so many new accounts so fast! And that’s why removing the Threads account also deletes your Instagram one! No way a bad app like that, missing the basic features (front what I’ve read in reviews), would have so many users so fast!