Solved
Analysis Workspace Visualization Data Source Settings "Lock Selection" Disabled
My table has six columns but I only want two of them in the visualization, but when I bring up Data Source Settings the "Lock Selection" checkbox is grayed out?

My table has six columns but I only want two of them in the visualization, but when I bring up Data Source Settings the "Lock Selection" checkbox is grayed out?

Rather than selecting the metric, select the sparkline immediately below it. After taking that action the option to lock selection should return.
Similar to most platforms you may select non consecutive items by using the ctrl key.
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