How to lock layer editing

Hello everyone, friends of Synfig Studio. I’ve searched and tried multiple times, however I can’t find how to lock layer editing. Does anyone know how to do it? The closest thing I found was Lock Selection: Lock Selection — Synfig User Manual 1.5.1 documentation

Thanks a lot in advance for all the help.

You are correct the only option is lock selection. Just group the layer and enable lock selection.

Or you can just disable the Vertex Handles from the options at top.

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