Primitives lock

In advance a great App.
My questions:
1 Very often I click on primitives that I do not want to edit. How can I lock and view the primitives?

2 How can I scale evenly?

Greetings from Germany

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For 1.

For 2.
You should use the Scale tool or the gizmo tool.
For the gizmo this is the big orange circle

Ah. So simple. Thank you verry much.