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I just switched from QGIS 2.18 to version 3.0.3. In the earlier version, setting layer transparency was easily done with the "transparency" slider from the Layer properties->style tab. See image below:

QGIS 2.18 layer properties "style" tab

The newer QGIS version, however, does not appear to display such a transparency bar, as seen in next image. Is there a simple way to change a layer transparency in this verion of QGIS?

QGIS 3.0.3 layer properties "symbology" tab

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You have to click on the layer rendering arrow (see the bottom of your second image) to access the slider and other option.

in QGIS 2 it was on by default, in QGIS 3 it's off by default...

  • Great! Talk about a simple solution! – LandryF May 31 '18 at 15:01
  • @LandryF Don't forget to accept the answer that helped you the most. – PolyGeo Jun 5 '18 at 19:38
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As an alternative option, you can open Legend tab and select Opacity slider widget.

It will add an opacity slider in the Layers panel.

enter image description here

  • 1
    I assumed the opacity slider was only available for rasters until I read your answer. Thanks @Kazuhito! – csk May 31 '18 at 19:49

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