A group of Microsoft Products and technologies used for sharing and managing content, knowledge, and applications.
Hello,
We appreciate you spent time doing test and sharing these detailed information with us.
It seems like now you can make list items show as alphabetical in SharePoint list, however, when you go to the connected PowerApps app, it doesn't show as alphabetical. You want to show the list as alphabetical in PowerApps as well.
May I know if my understanding is right?
Considering the issue seems only appears when you check the list in PowerApps, it may need to check the detailed settings in PowerApps for further investigation.
We searched a lot and found a similar thread:
Solved: Sort and Filter a dropdown - Power Platform Community (microsoft.com)
At the same time, if you need further help, considering we have a dedicated channel Microsoft PowerApps Community, to make sure you can get professional assistance, we sincerely recommend you go to the community and post a new thread. Members and experts over there are proficient in the knowledge of PowerApps questions, and they will also focus on your specific situation and provide specific suggestions.
In addition, if our understanding of the scenario is not consistent with yours, feel free to point it out, we will continue trying best to help.
Your patience and understanding are highly appreciated!
Best Regards,
Tina