Transparency can be applied in lots of ways in Affinity Designer.
Here are the typical methods for its use.
As solid Opacity, applied to strokes, fills and brush strokes.
As a transparency gradient, again applied to either stroke or fill.
As layer opacity.
As a layer effect property.
Opacity is a term you'll see in Affinity Designer—this is the opposite of transparency. An object with 0% transparency is fully opaque (100% opacity), while 100% transparency means the object is invisible (0% opacity).
Opacity quick keys
You can use the numerical keys to set the layer opacity of a selected layer(s) or object(s).
This quick access to opacity settings also applies to Brush tools in Pixel Persona.
To change the solid opacity of an object:
From the Color panel, choose stroke or fill from the Stroke/Fill color selector.
Drag the Opacity slider.
To apply a transparency gradient to an object:
From the Tools panel, select the Transparency Tool.
Drag across your object to apply a transparency gradient.
To apply layer opacity:
From the Layers panel, select a layer.
Click the panel's Opacity down arrow and drag the slider to adjust.
To use opacity quick keys:
Do one of the following:
Select a single layer or object, or multiple layers or objects.
Select a Brush tool in Pixel Persona.
Press a numerical key, or two numerical keys in quick succession, to set the opacity. For example:
Press 4 for 40% opacity.
Press 0 for 100% opacity.
Press 4 and 5 for 45% opacity.
Press 0 and 7 for 7% opacity.
To apply layer effect opacity:
From the Layers panel, click Layer Effects.
From the dialog, adjust the Opacity slider if available. Not all layer effects have the Opacity setting.