To synchronize Segment membership for your Contacts to Salesforce:
Create a Salesforce Custom Field to store Segment membership data. The new custom field will serve as a target for the synchronization showing to what segment(s) a contact belongs.
Add your new custom field to your Salesforce Contact Layout.
In Salesforce, go to any Contact record
At the top right, click Edit Layout, and the Enhanced Page Layout Editor will be displayed at the top of the page panel.