Synchronization of all folders

Hello, now I have set up an automatic check of letters every minute. It shows normally if a letter arrives and remains in the inbox, but I have several separate folders to which the letters are sent by the filter and they do not receive a notification until I clearly move to this folder with the mouse, then synchronization occurs.
Tell me how to set up synchronization of all folders?

You may want to right-click all your folders and select “Show if unread”…

Sub-folders of an IMAP account do not receive new mail notifications. That is for the Inbox only.

So if messages are moved by server-side filters, you will not get a new mail notification, but the folder unread count will be updated on the sync interval you have set.