At https://nextdoc.tiki.org/tiki-browse_freetags.php you can see the list of all the tags.
When you click on a tag it add the term to the search field and wait for further action from the user.
When I click on the search button the term will stay in the search field and other terms will be added.
This is a bit wonky and bad for UX.
Clicking on a tag should do the job, initiate the search for the object with this tag.
Viewing this video from the file gallery is not working (anymore) download the file: https://dev.tiki.org/dl1629
Media player's way:
Update and clarification
At https://doc.tiki.org/tiki-browse_freetags.php I used 2 tags (that have results, they are displayed in bigger font size): configuration articles
All selected = 0 results (what ?)
One selected = results (not sure what was searched... look like both)
Last selected = results that seems to be articles (Good)
Not only the UI is not great but if this is what was intended it very confusing and look broken.
In comparison with "all selected" and "last selected" and the results displayed I don't know what a user is supposed to understand. The options descriptions are also adding confusion, terms in a input (search) field are not "selected" while terms clicked on should be considered as selected (mobile era).
Finally and that was the point of this Feature request while I understand the flexibility of being able to choose more than one tag, the users todays (mobile) expect to select/touch and see results. (no need for extra click/actions)
We should have a one a tag touch=>search by default.
Eventually to preserve flexibility, and because it is little extra work, an "advanced search" button would be much better to display the actual search form with several options.
IE: One tag, All tags,
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To help developers solve the bug, we kindly request that you demonstrate your bug on a show.tikiwiki.org instance. To start, simply select a version and click on "Create show.tikiwiki.org instance". Once the instance is ready (in a minute or two), as indicated in the status window below, you can then access that instance, login (the initial admin username/password is "admin") and configure the Tiki to demonstrate your bug. Priority will be given to bugs that have been demonstrated on show.tikiwiki.org.