Sample rate in exported MP3s

[arco]

Here:

Dorico 5 mp3 export options?

Are there no options for degree of compression/bit rate/depth for mp3 export. While mp3 files are certainly smaller than wav files, the ones coming from Dorico 5 are still much larger than necessary. I exported from Dorico then imported into Audition and exported again from there are got files 1/4 as large with no loss of quality.

Edit: Ah, I might be wrong then, sorry