Yes. In your desktop settings, hold ctrl and click on every language you want to see. It's best to keep undetermined because some people don't tag what language their content is in. What you're probably seeing are these untagged posts, because I think registering your account asks which languages you want to see in the first place.
nvim for smaller projects, and vscode for larger ones mostly. Both because they're very extensible, support a lot of languages and language servers, and are quick to load files.
The Steam version in general is pretty buggy. The one I've been running into is the endorsement menu shuffling players and showing everyone as an enemy.
The only time I ever used it, they told me they chose not to support that site