Custom alert webhook not allowing text editing : splunk-search-dropdown

[joydeep741]

I have developed a custom webhook which shows a drop down using the  splunk-search-dropdown.

<splunk-search-dropdown name="action.msgbus.param.alertGroup"
search="| inputlookup alert_group_lookup.csv "
label-field="ALERT_GROUP" value-field="ALERT_GROUP"/>

This populates the lookup in dropdown but does not allow me to write something in the drop down text box.

Since my dropdown will have 10,000 values, I need the ability to search the drop down.

Please help, what I need to change