Visible outside of artboard:
layers outside of artboard
Invisible inside of artboard:
top of layer stack
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Sign up to join this communityVisible outside of artboard:
layers outside of artboard
Invisible inside of artboard:
top of layer stack
The arrow symbol next to your layers are an indicator that there is an underlying mask somewhere. If you scroll all the way down to the last one of your new layers – Oval Copy 5(?) – the layer below that should have the "Mask" option selected. If you disable this mask it should not be invisible anymore.