What operating system are you using?
Check internet connection. ModusToolbox gets BSP/Application information from remote server.
In this case, when facing the empty dialogue, please check the "Console" tab in your ModusToolbox to see if you can find a red log line saying:
Unable to open file at http://github.com/cypresssemiconductorco/mtb-super-manifest/raw/v2.X/mtb-super-manifest.xml. Some boards and apps may be missing. Check the logfile for a detailed error message.
If you are seeing this, you are facing the network blocking issue. Currently access to GitHub.com from some regions can be unstable. However ModusToolbox always needs remote access to GitHub.com to initiate new MTW projects. Please try again later to see if this changes.
You can simply try to refresh the URL below in your Web Browser, once it's properly displayed (not empty), you can say that the service is back online:
If you are continuously facing this problem, please consider using another Internet access point / VPN / Tunnel, and make sure ModusToolbox is correctly proxied. Or you could try the tips from the following thread link, which could also be a tricky way:
Sincere regards from C. L.