Hello @Ivan Mishchenko !

The "Number of characters in auto-generated update's title" option is connected with the getTitle method used for the event's title generation of the Timeline app.

The "Number of characters in auto-generated update's short title" option is connected with the getTitleShort method and used for the notification's title (which means to be compact).

But all changes in both parameters will not affect the "previous" content - the title with the 64th length will keep that length even if you change it to 128 or 32.