Change the opacity of a layer or directly in the tool
Hello, it would be nice if you could change the opacity of a layer without a mask. I like to draw the shadows with the Blob Tool and have to reduce the opacity of each path after each step. It would be easier if each path automatically had a previously set opacity. Alternatively, you could make this setting in the options of the tool itself. Thank you
Gabi

1. Draw a stroke with the brush and select it.
2. Change the opacity of it as you want it to be
3. Open Appearance panel
4. In the panel’s flyout menu, disable New Art Has Basic Appearance option — this would make each new object created to inherit all the appearance settings (including the opacity set).
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Actually, after reading this once again, I think there is a way to do exactly what you need.
1. Draw a stroke with the brush and select it.
2. Change the opacity of it as you want it to be
3. Open Appearance panel
4. In the panel’s flyout menu, disable New Art Has Basic Appearance option — this would make each new object created to inherit all the appearance settings (including the opacity you set, which is considered to be a part of 'complex appearance').The recipe is 6 years late, I know :) but perhaps it can still serve you.
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To affect an opacity of a layer, you should open Layers panel and target the layer by clicking a small round marker next to its name. Then set the opacity you want in Transparency panel — it will be applied to the layer itself.
That is not very intuitive at first, but becomes very clear after you get it.
But still there is a room to improvement.
Vote for this request if you find it useful: https://illustrator.uservoice.com/forums/333657/suggestions/32965078