How can I change the color of inserted objects? Unfortunately, I don’t have a color choice here below on the left
Hallo, mellotrack!
Warum kannst du nicht der Parameters Panel sehen?
Sorry my Deutsch lol I studied it a long time ago.
Click on the desired layer(= element), and edit it in Parameters Panel.
https://synfig.readthedocs.io/en/latest/ui/panel_parameters.html
https://wiki.synfig.org/Parameters_Panel
Or you can use the Fill Tool.
https://synfig.readthedocs.io/en/latest/tools/fill.html
I think this is what you need 