Where is Sequential Printing options?

Hi,
I noticed in the manual it says about Sequential Printing of parts that are on the platter.
I am using slic3r version 1.0.0RC3 and the expert mode but I can not see any options that I can set to complete individual objects and to set the clearances.

Thank you for any help

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appjaws - Core XYUV Duet Ethernet Duex5
firmware 3.1.1 Web Interface 3.1.1
Ormerod 1-converted to laser engraver, Duet wifi
OpenSCAD version 2020.07
slic3r-1.3.0, Simplify3D 4.1.2, Cura-4.4.1

in 1.0.0R2 it's under : Print Settings>Output options

I have not installed R3 yet so don't know if it's still there.

Thank you I couldn't see for looking.