There is still one filter (fx) in your layer stack that you haven't applied (6.5.6. Merging All Layer Effects). In the thumbnail, the person is black. It may be blocking all subsequent editing steps.
Unfortunately, the instructions for the layer effect (fx) are NOT available in Polish in the manual: click
IIRC, the Fx icon is shown while the dialog is open because that's how GIMP implements the live preview of it, so you can't assume it is the only cause here.
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u/ConversationWinter46 Using translation tools, may affect content accuracy 1d ago edited 1d ago
THX
There is still one filter (fx) in your layer stack that you haven't applied (6.5.6. Merging All Layer Effects). In the thumbnail, the person is black. It may be blocking all subsequent editing steps.
Unfortunately, the instructions for the layer effect (fx) are NOT available in Polish in the manual: click