Sometimes, the database permissions get a bit wonky and cause the databases to not appear in the control panel. Fortunately, this is easy to fix.
First, find the name of the database that WordPress is using. You can do that by finding your website in the file manager and then checking the wp-config.php file. There should be a setting DB_NAME that looks like if0_12345678_wp123.
Then, go to the MySQL Databases section in the client area or control panel, and verify that the database does not show up there. If it doesn’t, you can make it appear by creating a database with the same name. Doing so will NOT recreate the database, it will just add the required parameters so the control panel can list the databases.