CLOSE and SAVE

If you have made changes you want to keep, Close then Save the file.

Click on the purple R in top left corner, then Close.

Then select Synchronize with central:

The Synchronize with Central dialog box will appear.

Make sure all available tick boxes are ticked under After synchronizing with Central relinquish the following worksets and elements:

Basically you need to give back everything you've taken possession of so others can work on them.

Click OK and you are done.