Subtract From Selection. Bucket-Fill-Tool outside shape

[datalars@mail.com]

I'm a total gimp-newbie and this is probably an easy thing to do but I'm failing. I have three layers.

Layer 1. An image
Layer 2. A color(I chose foreground) which I have made a bit transparent.
Layer 3. A shape that does not totally cover layer two.

This shape I filled with a color with Bucket-Fill-Tool. That was no problem. But I want to fill the area outside the shape instead. I tried to do
Layer -> Transparency -> Subtract From Selection
but it didn't work. Any help is appreciated.

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I just realized I posted in the wrong Forum. Sorry about that. This can be deleted.

[Blighty]

(10-05-2019, 01:07 PM)datalars@mail.com Wrote: But I want to fill the area outside the shape instead.

Select > Invert, then bucket fill.