Since version 5, it's impossible to filter queries by Client on a mobile device in "Recent Queries"

[yubiuser]

See here.

How am I supposed to filter the query logs with a mobile phone browser?

Gave this some thought this morning, and came up with the following proof of concept: https://github.com/pi-hole/AdminLTE/pull/1568 Should allow both desktop and mobile users to enjoy the new filtering, with or without a keyboard. Keep in mind, this is still a draft/WIP but just to give an idea.