How do I make a magnifying glass work in all layers?

hi guys! well, I saw in some topics/videos how to make a "magnifying glass" effect, but it works only if all the objects are in the same layer with 'force own texture' on, so how do I make it work to all layers?

You can apply effects to layouts.

Click on the layout, add the fx in preferences.

You can apply effects to layouts.

Click on the layout, add the fx in preferences.

yep, but I need to apply the effect only on the magnifying glass not on the entire layout :/