Dear Carolina Jud,
Good day! Thank you for posting to Microsoft Community. We are happy to help you.
As per your description, it seems that you are trying to disable auto correct and auto capitalization in PowerPoint for Android.
If the understanding above is right, as the per the search and test on our side, we're afraid that there's no out of box way to achieve this in PowerPoint Android app currently. You may need to change the language or keyboard settings on your device as a workaround.Steps for turning off autocorrect for Android tablets and phones vary depending on which device you're using.
Given this, we sincerely recommend sharing your valuable feedback by selecting your profile picture in the top left and then choose Send Feedback within PowerPoint Android app. Feedback submit by this way directly goes to the related team, this is the best way to let PowerPoint developers know your requirements and comments, help improve the product and make it better for you and others.
For your reference: How do I give feedback on Microsoft 365? - Microsoft Support
If our understanding of the scenario is not consistent with yours or anything unclear, please feel free to post back and point it out. We will continue to help.
Sorry for the inconvenience again. Your patience and understanding are highly appreciated.
Hope you stay safe and healthy.
Sincerely,
Rhoda | Microsoft Community Moderator