With Spring 20 Release, Salesforce administrators received the new functionality to update field values by triggering a before-save flow when a record is created and/or updated.
I wrote a blog post that describes how to keep Salesforce field values clean using this functionality. Original blog post is here at this link.
With Summer 20 Release, the configuration options for new flows have changed. I created this video to show you how the flow will need to be built in the new Release: