I am trying to implement custom site admin search and asset search with custom project related predicates in touch ui.I am planning to extend site search and asset search.Can you please share some details how to accomplish this.
Posting for new visitors as question is posted in 2019. This requirement is not much descriptive but I had similar requirement.
For example, sort site admin search results in desc order on modified date. I edited 'site admin search rail' under Tools --> search form and added hidden property predicate as shown below