How to make the selection transparent in QGIS 3.0?

Geographic Information Systems Asked by user3386170 on December 21, 2020

Despite setting the layer or the symbology of the features to semi-transparent, when performing a selection, the features become solid. I want to edit those features based on properties of the features/background image below them. How can I set a transparency when features are selected?

2 Answers

Make selection color transparent by reducing opacity in Set Selection Color window.

Settings menu > Options > Canvas & Legend > Selection color

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The same setting is available on a project-specific basis in the Project > Properties menu. You may need to restart QGIS to see the changes.

Here are another few options for making the background visible behind selected features:

Use an outline symbol type:

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You can pair this with centroid fill:

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Or add multiple, offset outlines for a more filled polygon appearance. The example image below has 6 symbol layers with offsets of 0, 1.5, 3, 4.5, 6, and 7.5 mm.

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Correct answer by csk on December 21, 2020

In QGIS 3.10.9, this might not work. Using this path (Settings > Options > Canvas & Legend > Default Map Appearance) to change colors/transparency of selected features will be overridden by the project properties. I successfully changed color and transparency of selected features by going to Project > Properties > General > Selection Color and making my changes there.

Answered by Marc Hoshovsky on December 21, 2020

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