If mails are grouped, only those should be grouped that a) mention / quote another mail OR b) if the mails arrived within x minutes.
Because as it is at present with me mails are grouped which were sent years(!) after each other. They also have nothing at all to do with each other. Only because both have the same title.
I really agree with this!! I'm new on ProtonMail and I really miss this feature!
This is definitely a huge pain point, urgent enhancement needed!!!