Power BI export does not fill up PowerPoint slide

From the comments provided by other users and my testing, it looks like there is padding added to the bottom of the image that is exported. It does not appear that there is padding on the sides. It appears like a white margin/border because

• the bottom padding is white
  • This can be controlled/changed with FORMAT PAGE > WALLPAPER > COLOR
  • In my report, the bottom border of my background/report is gray, so I made the wallpaper gray to make the padding look like it matches and is part of the background border.
• there is a gap (left/right) between the exported image and edge of the PPT slide which reveals the PPT slide color.
  
  • If you change the PPT slide color, the left/right gaps that look like a border/margin will be the PPT slide color.
• I'm using VERTICAL ALIGNMENT > TOP.
  • Your results might be different if you use MIDDLE.
  • I don't know if that changes the padding behavior (on top) or dimensions below.

Through trial and error, I was able to minimize the left/right gap with dimensions of 716px x 1292 px on most pages. For some unknown reason, at least one page required different dimensions. These dimensions might not work for you, as other dimensions were suggested to me (see links below). So you might need to do your own trial and error.

Also note that the arrangement/positions of your visualizations might shift from Power BI to PPT export. In other words, on at least one page, my visualizations are perfectly aligned in Power BI, but they are shifted and unaligned in the PPT export. I don't know whether or not this is related to the dimension changes or Power BI export padding.

See these comments for more technical details:

https://community.fabric.microsoft.com/t5/Service/Power-BI-export-does-not-fill-up-PowerPoint-slide/m-p/5002164/highlight/true#M294209

https://community.fabric.microsoft.com/t5/Service/Power-BI-export-does-not-fill-up-PowerPoint-slide/m-p/5015213/highlight/true#M294412