I just updated to GIMP 2.10 from 2.8 and I can't find the place to make the window always open with a transparent background. Thanks! Carol
11 Answer
If you mean the transparency checkerboard, see Edit>Preferences>Display>Transparency>Check styles.
If you want the "Background" layer to be transparent in new images; see Edit>Preferences>Default image>Advanced options (click to unfold)>Fill with (and set to Transparency of course).