[Gimp-user] Gimp on M1 Macbook Air will not export in 300 dpi

[Julie Barmazel Stiebritz <barmazel mac com>]

Hi there. I’ve installed GIMP 2.10 (first .24 and then .28) on a new MacBook Air with M1. 
It will not adjust print size on export.
I can change the image print size while on Gimp to 300 dpi, but the export is always 72 dpi.
Have deleted and reinstalled GIMP; have used current update. 
GIMP will only export docs in 72 dpi. 

Checked the issues archive and can find the problem discussed but no resolution. 
Makes GIMP unusable for me :(((

Many thanks!
Julie