Filter images in album

If i filter images in a Lightroom CC Album throught the filename, it only allows me to search for two images at the same time. If my clients select lets say 100 photos that they like, i have to filter and mark two pictures as favorites and repeat this step 50x to mark all of the 100 photos my client liked.

I called the support and the guy on the phone just had the same problem. Never heared back since our call was finished and he promised me to solve the problem.

I had this problem since more than a year and it really sucks!

Anyone have a solution for that?