I would like to find in a future version of #Thunderbird the functionality offered by "Lightning Colors Reminder" extension (until V.78, then the maintenance ended). It indicated in the reminders window the color of the calendar from which each notification came.
It was a light indication, a colored vertical bar to the left of each event title recalled, and it helped me a lot to reorganize my work and meeting priorities, quickly choose for each appointment of how many minutes I postponed its alarm, to give you some examples of the decision-making help that it brought me.... Maybe it was also your case 🙂 ? Since then, we can do without it, but, yes... it was so useful and helpful !
PS: sorry for my English in automatic translation...