I created a coverage layer ( polygon) for an atlas. It contains rectangle polygons which define the boundary of sheets (somehow irregular indexing along my layer). when I print the atlas without changing the scale of my map (scale 1:1600), I have the same overlap that I defined in my coverage layer (sheets polygon). But when I force to map to specific scale (1:1000) I lose the overlaps between the sheets. How can I change the coverage layer scale to 1:1000?
I know that I can use the option of best fitting scale, but I need to force my coverage scale to specific scale.