(hasParent) ? parent.opacity : value;
The parent's opacity value acts as a multiplier for the child's
Maintain stroke width while scaling layers. Apply to stroke width property
Control the opacity of a layer by the dropdown menu selection. Add a Number [1,2,3,etc] to the beginning of layer to make it work
How to use the Composition Width & Height expression to center and scale a layer
AfterEffects_Tricks
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