Often I set up a rule, select the option to apply to existing mail in my inbox, then go to the inbox and don't see anything happening. I am then unsure if there is a mistake in my rule, or Proton is busy processing in the background and I just need to wait. It would be nice if there were some visual indicator or message that rules were processing the inbox. Another useful piece of info would be when I "preview" the rule, it lists the messages that will be affected.