How to add blur / round corners to only white rectangle layers

Question

I want to add a blur or rounded rectangle to only the white rectangle layers, which are behind the text.

Trying rounded rectangle with the layer selected, only modifies the main layer.

I have tried using a Layer Mask (white), putting the mask to selection, and applying the filter to the mask, then apply the mask... Is Layer Mask = White the wrong option?

Applying the Layer Mask does not work; it just shows the original layer.

When I apply the rounded rectangle to the mask, it rounds the mask, but on apply, it doesn't change the actual Layer.

Is there any way that I can crop to Layer Mask?

Any tips for a frustrated noob? I've tried following these tutorials, without success:
How to apply a filter to a layer and its mask at the same time (in a single pass)?

Michael Schumacher · Answer

With layer masks, white equals visible and black equals invisible for the content of the layer they are attached to. The description above doesn't mention using black color anywhere, so I assume this wasn't done.

A possible approach with a rounded rectangle would be to use a black layer mask initially, and then fill a rounded rectangle with white.

Seems overly complex for this case, but works as well if the result wouldn't be rounded white rectangles.

xenoid · Answer

A simple solution:

Select each rectangle in turn
Make a rectangle selection on the rectangle, with rounded corners and/or feathering
Select>Invert, Delete

How to add blur / round corners to only white rectangle layers

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