Resyncing an App reloads the App in order to display the most current app configuration changes that may have been made (aside from those to Homepages). In using this feature all of this is possible whilst avoiding the need to navigate away from a Record or even log out and back in. This is primarily used by app builders as users get the most updated version of the app 10 minutes after the app is updated.
Initiating a Resync
Click on the ellipses in the top right corner of your Workspace and simply select 'Resync App'.
NOTE: Please be patient as Resyncing an App is different from refreshing a webpage and may sometimes take a few seconds to begin.