When you submit an application, it lands with the respective employer. Exactly which individuals at the employer have access to your application is difficult for us to answer, as it entirely depends on how that particular employer operates!
However, it is often quite restrictive regarding who at the employer can see which applications, and usually, only those involved in the specific recruitment and higher management have access to them.
If this is something you feel is important to know, contact the employer directly, and they can assist you!
It's also good to know that the applications you submit will not be available to the employer indefinitely. After a certain period, they will be removed in what is known as a "purge." The vast majority of employers do this, but they may have different timeframes for when this occurs. They can provide more information if you want to know what will happen to the applications you have submitted to various employers.
For those with an account
No employer will be able to access your account and see which other applications you have sent to other employers; that information is only for you!
An employer can only see the applications you have sent specifically to them.