Simply use the show window hot key and start typing

It also works in "All" mode, which is the default. Also you can use Alt+Enter and Shift+Enter to mimic Alt- and Shift- clicking on tags (NOT and AND operations)

You can enter the tag name into the search box (and even use autocomplete for that), then press Enter, and this tag will become selected on the tag sidebar.

We will start it after the release of version 4.0 with new UI. So, somewhere in 2019 is the best estimate I can make.

Thanks for the suggestion!

Thanks for your suggestion!

Also possibly add expanding/collapsing sections