Now missing from Slicer IGT? Choosing Locator Source

Page 15 of the IGT tutorial “OpenIGTLinkTutorial_Slicer3.6.2_JunichiTokuda_Dec2010.pdf”
shows a “Visualisation / Slice Control” dropdown but it’s not there in the current version.
How is this step now done? Thanks

That tutorial is for a very old version of Slicer. Could you use a newer version? Most tutorials on this page are still usable, although they are also a few years old: User tutorial | SlicerIGT