The dropdown we use is a component from bootstrap framework. You can see the documentation here
For the standard advanced form the function is in functions.php at line 589 and is called wpestate_show_search_field_classic_form()
In there you would find the dropddown code and you can start there .
I think there are already made solution but it has to be implemented. Look on Google for “multiple select bootstrap dropdowns.”
The answer is based on 1.11 theme code and the advanced search changes made in this theme version.
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