I have been asked to increase the size of Part Description. Drawing from my experience of Windows Desktop App Development, I have tried to do so in App Studio but have been unsuccessful. Is there a way to accomplish this?
Modifications can be done in Extended Maintenance however, stock fields can’t be modified. If you need a longer field I suggest you create a UD field on the Part table.
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I read this differently than @Randy…
If you’re looking for more “displayed” information in the UI… You can add a text-area directly under the existing description text box. You can set the number of visible rows in the text-area properties.
Just set the binding to the same as the description field. Part.PartDescription, for example.
They’ll both show the same data and if you change one, they both change.
You can also remove the databinding to the description field if you don’t want the standard text-box description to be visible. The only drawback is you will lose the “translation” functionality.
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Ah, yes, if you’re looking to expand the size on screen then your method is correct.
We have had the same issue because our part descriptions are quite long. Our solution was to create a custom layer in app studio that added a “text area” component to this screen and bind it to the same field (Part.PartDescription) as shown circled in red on your uploaded image. At this point, you can hide the original text box to avoid confusion, if you want. This text area will function just like the text box.
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Looks like we were typing the same solution at the same time! 
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This suggestion works fine and dandy. Thank you guys!!!
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Part.PartDescription is already an unlimited length (nvarchar(max)) DB field.
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Please remember to mark the solution to your question so that others can quickly learn from this by identifying the exact post that solved your issue.
We had a similar request and found that description was used on labels. 
Often users ask for text when maybe we’re better off putting information into dedicated fields. Large memo fields are for humans, but fields are better for automation.