How can an Arithmetic Channel Calculation's units be changed in LabChart 8 for Mac?

For the channel you would like to configure, mouse click on the Channel Title Bar to access the Channel Calculations drop down menu, and select Arithmetic.  
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If you do not see the unit you would like to use in the default Units list indicated above, choose the Define Unit option from this same list.

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The Define Unit Pop-Up Window will appear, and you will be able to create the unit you desire, such as milliVolts (mV) in the example image above.

Please contact ADInstruments Technical Support if you need further technical assistance regarding this issue.