Is there an option or way of MOVING emails to a Folder defined in the Filters but KEEP looking for other matching filters if the first filter matches. If there is, I can't find it. At the moment I have to use 'Copy To' so the email gets copied to ALL the the matching filters and then go to the Inbox and delete the source one there. In an old email software I PRIMARILY use, called Virtual Access, Thunderbird 'Filters' are called 'Rules' I have attached a screen shot of the 'Rule' page in which you see that the Rule (aka Filter) is to 'Place' (aka Move) the message in a Folder and the option to 'Stop looking for other matching rules if this rue matches' is unticked.

In passing, the other reason for continuing using Virtual Access, is that it you can manipulate Threads. You can re-thread an email in a Folder (but only in that folder) to another email, provided the email to be re-threaded is more recent than the one you want to re-thread it to. You can also make an email a Root email (an unthreaded email) within the folder.