Draw rectangular selections with the Rectangle tool

Select Select area > Rectangle  .

Select Rectangle again to access the more   menu and adjust the Feather slider to define the feathering width as needed.

Draw a rectangular selection border over the area you want to select.

Select the more options   menu and choose from the following as needed:

• Load mask into selection: Add your layer's existing mask to the selection you're creating.
• Select all: Select all content in the active layer.
• Invert selection: Invert the selection so that the deselected area becomes the selection.
• Clear selection: Clear the selection.

Once the selection looks good, select the checkmark  .