A family of Microsoft presentation graphics products that offer tools for creating presentations and adding graphic effects like multimedia objects and special effects with text.
Dear Kenn Konstabel,
Good day! Thank you for posting to Microsoft Community. We are happy to help you.
As per your description, it seems that you are having concern with PowerPoint, cannot set a common proofing language for all slides and all objects in one step, text boxes are messed up in earlier version.
We do feel your pain about the situation and feel sorry for the inconvenience caused. Considering that as forum support, we may have limited resources and permission with product development, given this, we'd sincerely recommend you send feedback about the behavior via File>Feedback or Help>Feedback within PowerPoint. Feedback submit by this way directly goes to the related team, this is the best way to let PowerPoint developers aware of this situation, help do investigation for the issue and fix it soon.
Meanwhile, please also consider sharing your feedback in PowerPoint Feedback Community and voting for the similar feature request shared in the feedback site. The Product Team is in-charge of the feedback site, and they are constantly checking the comments and feedback from our customer. Your vote will increase the awareness coming from the related team. Many features have been developed or improved based on users' comment. This is the quickest route to get your feedback to the developers’ ears.
Similar request for your reference: The language button at the bottom should let you change the language of the whole file · Community (microsoft.com)
Changing proofing language · Community (microsoft.com)
We will also raise feedback on our side. Sorry for the inconvenience again. Your patience and understanding are highly appreciated. Hope you stay safe and healthy.
Sincerely,
Rhoda | Microsoft Community Moderator