Don't know how to do that using the GUI, but for the opacity you can use these 2 lines of python in the QGIS python console. It will set all your selected layers to 50% opacity.

for layer in iface.layerTreeView().selectedLayers():
    layer.setOpacity(.5)


I think the stroke style is harder to change because all these layers can have different symbologies.

Hope it helps!
Raymond


On 01-04-2022 09:47, Roland Spielhofer via Qgis-user wrote:
Hi,
I have a set of similar layers where I would like to change certain properties for all layers in the same way.
* change opacity to 50%
* change stroke style to "no pen"
When I select multiple layers and open properties -> symbology, I just change the styling of the first layer, not for all.
Is there a way to do this?
Regards,
Roland

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