I used the Eraser Tool only.
Create a new layer, fill it with the same one as the document (white) and set it as a background (at the bottom of the layer stack).
With the Shift key filled in it is possible to draw straight lines.
When erasing the border lines automatically, the transparency will be filled by the white of the bottom layer.
![[Image: tS1JbxX.png]](https://i.imgur.com/tS1JbxX.png)
at https://i.imgur.com/tS1JbxX.png
Create a new layer, fill it with the same one as the document (white) and set it as a background (at the bottom of the layer stack).
With the Shift key filled in it is possible to draw straight lines.
When erasing the border lines automatically, the transparency will be filled by the white of the bottom layer.
at https://i.imgur.com/tS1JbxX.png