Data exceeds the limit... 300 Rows??

Hi Cyrilbrd 
This is a known issue.

Please refer :

https://community.fabric.microsoft.com/t5/Issues/Export-only-extracts-300-rows-on-Summarized-Data-File-Format-csv/idi-p/3408431

If this post helps, then please consider Accepting it as the solution to help the other members find it more quickly.

HI Cyrilbrd ,

This is a known hot issue that mentioned with lots of users(this issue already been submitted). Power bi team are working on it, and I will update here if any ETA.

Update: 

This issue has been fixed by power bi team and will be apply to the new verison(v. 2.121.903.0) release soon.

Regards,

Xiaoxin Sheng