In Codex Desktop, the usage limit (numbers) is not visible when both the left and right sidebars are open. This makes it difficult for users to monitor their remaining usage while working with both panels expanded.
You are welcome to discuss Codex issues on the forum, however the official place to report and track them is the GitHub issue tracker for OpenAI Codex.
I had ChatGPT search for a similar issue and those presented were not the same as yours.
Try searching the existing GitHub issues for a closer match. If you cannot find one, then open a new issue with as much detail as possible.
If you find an issue that matches your problem consider adding a reaction on the GitHub issue page itself, as reactions on GitHub help the developers gauge impact and prioritize work.