42.9 and the introduction of Public spaces are a great new offering. However it's badly counterintuitive that you cannot search for Public spaces from the search field at the top of the Webex app - the one that users have grown accustomed to using to find things, including spaces. You can find public spaces that you are already a member of but others do not appear at all.
Speaking for myself after installing the update I immediately went to that search field to find a Public space one of my coworkers had created as a test. I was quite surprised to return no results at all. I had to hunt around in the UI and just happened to stumble upon the Explore Public Spaces option in the "+" menu.
Public spaces should appear in results from the normal search field, either listed among Private spaces or within their own results category. Having to go to the "+" menu to search for them is not at all intuitive for users.