At first, I am sorry for English, but I use a google translator. Maybe someone will write in Polish. I installed thunderbird 78.5.0 (64 bits) nowhere I can find information on how to set this program to download emails from the server and not to stay on this server. My point is that they should be downloaded to the computer and the server will then be clean without a message. That's what I had on my previous computer and it suits me very well. There is only information about leaving messages on the server everywhere, and I don't want to leave them. Please, ask for help screens where and what to set or where to enter what.