Bug reports: After update to 1.38 the check box to lock active selection is missing in the Scene panel…
I don’t know if it has been moved to some other place…
Looks same on IOS
It’s not a bug, I removed the option by default on 1.37 (it was in the log!).
You can add it back as a bottom shortcut (Interface option).
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At the start of Nomad, switching between objects in the viewport worked differently.
It would switch to an object just by making a drag gesture.
Now you need to tap on it which greatly reduce the number of false switching.
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Thanks 
… I didn’t notice that… keep up the Good work…