I have an inquiry regarding the graphic frame

I inserted a barcode into a graphic frame in Dorico, but it appears too small as shown in the image. Is there a way to increase the size while maintaining the aspect ratio?
If I use the ‘Fill’ mode, the aspect ratio is not maintained, and it looks stretched.

What file type is the barcode? It looks like a raster image from the picture.
I suggest using SVG.

The file type is PNG.
I want to fill the space while maintaining the aspect ratio of the PNG file.

If you select this it should do what you require, though it may not fill the whole frame.
If you want to share the specific barcode image we can try it to see what is happening.

How can I fill the entire frame with the barcode without reducing the frame size?

I suppose that the image represents the bar code inside a bigger white or transparent frame. If so you could crop the image to the actual frame of the bar code.

The background in the PNG file is only as large as the barcode. How can I make it fill the frame after selecting “aspect fit”?

Can you attach the PNG graphic itself here, zipped up?

I couldn’t finish.
Is it an issue with the PNG graphic itself?
Should I edit the image first and then insert it?

k.k while you type an answer in this forum (as I am doing just now with this post), you can drag the PNG graphic file into the window (the one where you are typing into). The file will automatically be attached.