I don’t know if this is a bug or it was changed on purpose but on SonarQube 6.7 (LTS) you are able to select multiple tags to filter projects on projects space the same way as filtering by ratings, languages, …
Today I realize that in 7.x versions this feature is missing. For me it doesn’t make any sense to be able to tag a project with multiple tags if you cannot filter later.
It works on issues space selecting multiple rule tags, but it is not working on projects browser page when selecting project tags.
I’m using macOS with Safari, but I tried with Chrome too without success. I tried using “command + click” instead of “ctrl + click” but it doesn’t work.
Could you confirm that it works for you with project tags?