Dragging Events in Lightning Calendar.
Before the Thunderbird update to Version 128.3.1esr it was possible to click on an Event in the Lightning Calendar and drag it to a different day. You can still do this when the Calendar is displayed in 'Week' mode, but now you cannot drag an event to a different day when the Calendar is displayed in 'Multi-Week' or 'Month' mode.
Opaite Mbohovái (1)
I have discovered that this problem has been highlighted elsewhere in bugzilla 1754467.