From this website (the 'level' part of this is what you're looking for):
"Using the Effects Panel
For this technique, you will need to harness the Effects panel. To access the panel, choose "Window" > "Effects" from the main menu. Here, you can adjust a wide range of transparency effects, including:
Blending Mode: Adjusts how an object's colors blend with other objects.
Opacity: Changes the object, stroke, fill, or text transparency.
Level: Opacity settings for the Object, Stroke, Fill, or Text.
Isolate Blending: Applies blending to an object group.
Knockout Group: “Knocks out” or “blocks out” underlying objects, based on the opacity and blending settings.
Clear All: Clears any effects placed on an object, and reverts the blend mode to Normal.
FX: Shows a list of all transparency effects. "
Kaan
I found a way to do this. You need to access the effects tab which allows you to change the opacity of each element individually.
https://www.shutterstock.com/support/article/how-to-change-opacity-in-indesign
From this website (the 'level' part of this is what you're looking for):
"Using the Effects Panel
For this technique, you will need to harness the Effects panel. To access the panel, choose "Window" > "Effects" from the main menu. Here, you can adjust a wide range of transparency effects, including:
Blending Mode: Adjusts how an object's colors blend with other objects.
Opacity: Changes the object, stroke, fill, or text transparency.
Level: Opacity settings for the Object, Stroke, Fill, or Text.
Isolate Blending: Applies blending to an object group.
Knockout Group: “Knocks out” or “blocks out” underlying objects, based on the opacity and blending settings.
Clear All: Clears any effects placed on an object, and reverts the blend mode to Normal.
FX: Shows a list of all transparency effects. "