It is theoretically possible, but you would need a coder’s help. If, in our plugin’s Settings page (not the form itself) you have not already done so, change the Combobox script from Chosen to Select2. The Chosen script is included with/used by our plugin by default. However, it is now pretty much abandoned and has not received any major updates in a long time. It has poor support for iOS devices for example.
In the current version of our plugin, there is an option in our settings page to choose which (Combobox) script to use.
Go to wp-admin
-> Search & Filter
-> Settings
-> Combobox Script
Change this from Chosen
to Select2
The Select2 script is then available for you to apply to the form. Select2 is maintained now by the WooCommerce team, who are, of course, owned by Automattic, the owners of WordPress, and as such is used by a lot of themes and plugins. In the next version of our plugin, we will switch to Select2 as the default.