Alex T⚜️ LeonidS I understand technically that there is a limit for the current select field because you're adding all values to page. Can you add a new field that allows a user to multi-select values by querying the database at selection time (i.e. Remote Data Loading)? This way you do not have to load all values to page and the user can search and multi-select.

Here are some examples. 

https://select2.org/searching

https://selectize.github.io/selectize.js/

https://ej2.syncfusion.com/documentation/multi-select/data-binding/