Groups within Teams Free for shared interests, collaboration, and communication
Communities cannot be searchable because all communities are now Private. The option to create public communities is no longer available.
What are Communities and Channels in Microsoft Teams Free? | Microsoft Support
Can I still make my Teams Free community public or searchable?
While creating or updating your community, if a Public option appears, the toggle setting will keep the community as private. All communities in Teams Free are private by default and will no longer appear in searches and recommendations. To share your community, you can invite members directly.