Could you pls tell me where to set the dimensions thickness in Print As Image - want to export in greater resolution to edit in Photoshop and still being able to identify the dimensions (which otherwiese get too pixelated)
Are you saving out the images as screen grabs or using Print, set to raster image?
If it’s the latter, you can set the line weights by layer. Keep the dimensions on layers separate form the objects you’re dimensioning and you’ll have good control over the relative thickness of lines.