We are using multi-select field for our end user request submission form but the search is not working when we access this field as an end user on a request form although search is working for same multi select field when we access ticket as an agent.
Based on discussions with Zendesk support team, auto search feature in the end-users interface (request form) for multi-select field is not yet supported. The only way to go through the selections is by scrolling up and down.
It is very important for us to enable auto-search on multi-select field because it's not possible for end-users to scroll 1000's of entry to select a correct options. As a next step, we are creating this post to get help from Zendesk side to fix the limitation with multi select field for end-user on priority.