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In GIMP text layers don't have a background colour. So, what you want isn't possible.
To have a background you'd need to create a new layer under the text layer, select a rectangle to surround the text, then fill it with colour.
If you change the text, you would need to delete the filled layer, make a new rectangle layer to fit the new text, and fill it ...
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Reduce the image size by 50%. Then increase it by 50%. This should do it and will be quite easy.
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