Found it...
Preferences > Interface > Previews > Enable layer & channel preview
On 13/11/2021 09:28, Andrew Clarke via gimp-user-list wrote:
Hi, I seem to have lost my thumbnail image of the layer in the layer
tree, I am getting an thumbnail of "two squares" as layers not the
layer image itself.
I am sure I have switch it off somewhere but for the life of me I
cannot find the check box to enable it to show. Any pointers ?
Many thanks
Andrew
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