Guesses you added select and autocomplete in methods addModalTemplate andeditModalTemplate? In this case, manual initialization is required.

const select = document.querySelector('.select');
const selectInstance = mdb.Select.getOrCreateInstance(select);

const autocomplete = document.querySelector('#autocompleteId')
const autocompleteInstance = mdb.Autocomplete.getOrCreateInstance(autocomplete)

Okay, got it!! So for adding new fields, we customize the calendar-plugin javascript but when we try to add MDB "Select" or "Autocomplete" fields they didn't render properly. So can you please help us to render properly I found a way how to add fields into the popup but it renders normal HTML "Select" or "Autocomplete" fields not MDB "Select" or "Autocomplete" fields?

Here is the video so you will get the idea (As you see in the video I set the select box in the above calendar and inside the popup so the result is inside the popup select box is not properly rendered): https://www.awesomescreenshot.com/video/6285157?key=cea55f71e2741a211dd58539aa7e70e8

Please help us to render a select box inside the calendar popup!

Thank you.

At the moment, we do not have such an option. I will add this to our list of ideas and we will consider adding this option.